MTB Tech Rumors and Innovation

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10/23/2024 7:27am
Nobble wrote:

New Sentinel is up.


https://www.transitionbikes.com/Bikes_Sentinel.cfm


Looks pretty much like exactly what I was hoping for. Now to decide if I want to open up my wallet.

Pretty sweet looking bike. If I didn't already open up my wallet for a Megatower this would be in the running. Stays are a bit on the long side, but I'm loving everything else. 

gibbon
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GB
10/23/2024 8:13am Edited Date/Time 10/23/2024 8:14am

You have got to admire Si's dedication to sticking to his principals, steel and uk manufacturer.

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Suns_PSD
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Austin, TX US
10/23/2024 8:52am
Jotegr wrote:
That 9-45t cassette from shimano is neat. I've wanted a tighter 12 speed option for a while other than stuff like e13 and garbaruk. I ran...

That 9-45t cassette from shimano is neat. I've wanted a tighter 12 speed option for a while other than stuff like e13 and garbaruk. I ran e13's 9t stuff for a while and on most bikes it worked well, some bike shapes didn't play nice with the 9t for the most part it worked out well.

Shimano had that XTR 10-45t cassette but as far as I could tell it was vapourware; I've never managed to see one in real life. But 9-45t allegedly coming on a bike? XTR LINKGLIDE being 11 speed? This is crazy. it's like they listened to enthusiasts instead of the MORE GEARS BIGGER CASSETTES MORE BETTER crowd. 

The 10-45 12 speed is commonly available.

However, the 10-45 11 speed that was announced, and even listed incoming on websites, never made mass production.

That said, I bought one from a bike shop that had 3 of them and it's on my Smuggler as we speak, and it's perfect gearing and shifting with an absolutely awesome weight. I mean, the entire set up is .5# lighter than a Transmission right off the rear wheel.

Does creak like a mofo however like all XTR Shimano multipiece cassettes unless you disassemble and grease between the gears, which I don't.

The 11 speed is really just the 10-51 12 speed, with the 1st gear removed.

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Suns_PSD
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Austin, TX US
10/23/2024 8:55am
segamethod wrote:

New Sentinel has a reach in size L shorter than the Smuggler. The pendulum finally swings?

I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach.

 

The bikes need to offer 10mm of reach adjust for those of us in between.

 

That said, the new Sentinel looks like an ideal AM rig to my eyes.

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seanfisseli
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Santa Cruz, CA US
10/23/2024 9:27am
As soon as you lock up all bets are off course. To be honest I’ve never really ridden anything where I found pedal kickback to be...

As soon as you lock up all bets are off course. To be honest I’ve never really ridden anything where I found pedal kickback to be annoying beyond when the wheel is locked up. Even going back to back with and without chain. There’s a part of me that actually kind of likes being able to use chain tension to keep it a little higher. Let the cranks rotate backwards a little on landing and the impact is lessened using more travel. Keep feet entirely flat and push through it for more efficiency. 

Had this realization at northstar on closing day. Finally realized that on some drops my ankles were getting blasted by PK and that I needed to let my feet rotate on impact.


I don’t view this as a positive, though. Trying to absorb impacts while rotating my feet backwards is not enjoyable or efficient or very effective. If riders have adapted to this behavior that’s fine for them but I would much rather be on a bike that is designed to avoid that phenomenon.


My biggest issue is that this has to be putting more weight in our hands/force into our upper body. I want to ride through my feet not my hands, ESPECIALLY in rough sections and in moments of impact. I’m stoked for the innovation happening around PK because it’s going to unlock a style of riding that a lot of us didn’t even know we needed

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BrambleLee
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Portland, OR US
10/23/2024 9:36am

Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. 

I wish SRAM hadn’t done it to begin with, but now that the toothpaste is out of the tube, everyone else kind of needs to do it too, no?

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10/23/2024 10:29am
BrambleLee wrote:
Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. I wish SRAM hadn’t...

Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. 

I wish SRAM hadn’t done it to begin with, but now that the toothpaste is out of the tube, everyone else kind of needs to do it too, no?

I really hope that's not the case. The angles created are just not ideal in any way. Why would Shimano need to do it?

3
Eae903
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Laramie, WY US
10/23/2024 11:14am
BrambleLee wrote:
Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. I wish SRAM hadn’t...

Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. 

I wish SRAM hadn’t done it to begin with, but now that the toothpaste is out of the tube, everyone else kind of needs to do it too, no?

I really hope that's not the case. The angles created are just not ideal in any way. Why would Shimano need to do it?

Chainring clearance on the frame right? Frame manufacturers are wanting to make stays wider at the frame or main pivot, so the Chainring has to move out. 

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BrambleLee
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Portland, OR US
10/23/2024 12:19pm
BrambleLee wrote:
Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. I wish SRAM hadn’t...

Re: upcoming Shimano updates—I’ll be very curious to see whether they follow SRAM’s lead on pushing the cassette outboard for a 55mm chainline. 

I wish SRAM hadn’t done it to begin with, but now that the toothpaste is out of the tube, everyone else kind of needs to do it too, no?

I really hope that's not the case. The angles created are just not ideal in any way. Why would Shimano need to do it?

Eae903 wrote:
Chainring clearance on the frame right? Frame manufacturers are wanting to make stays wider at the frame or main pivot, so the Chainring has to move...

Chainring clearance on the frame right? Frame manufacturers are wanting to make stays wider at the frame or main pivot, so the Chainring has to move out. 

Pretty much all the frame manufacturers moved to a 55mm chainline ahead of transmission’s release. SRAM pushed their cassette outboard, so it pretty much all comes out in the wash. But it fucked things for older components. 

Newer frames, for the most part, are requiring a crankset based around the 55 chainline, so now if the cassette isn’t pushed outboard on the new shimano groupsets, chainline will be awful. 

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1
overbiked
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10/23/2024 1:50pm
IMG 1660.jpeg?VersionId=bMk5KFKTZih7lB.21.I8ngE

Saw this EXT Vaia at Sundance loam pass event on an Ari, talked to the ext guys for a bit about it. He said it’s internally adjustable from 170-200, meant for heavy enduro and dh. He said they’ll start selling hopefully in November for around 2k USD

30
Splayleg
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10/23/2024 4:12pm
segamethod wrote:

New Sentinel has a reach in size L shorter than the Smuggler. The pendulum finally swings?

Suns_PSD wrote:
I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach. The bikes need to offer 10mm of reach adjust...

I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach.

 

The bikes need to offer 10mm of reach adjust for those of us in between.

 

That said, the new Sentinel looks like an ideal AM rig to my eyes.

That’s why any new bike not running a 56/56 headset standard to allow for reach adjust with no drawbacks is blowing it

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10/23/2024 5:24pm
segamethod wrote:

New Sentinel has a reach in size L shorter than the Smuggler. The pendulum finally swings?

Suns_PSD wrote:
I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach. The bikes need to offer 10mm of reach adjust...

I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach.

 

The bikes need to offer 10mm of reach adjust for those of us in between.

 

That said, the new Sentinel looks like an ideal AM rig to my eyes.

Splayleg wrote:

That’s why any new bike not running a 56/56 headset standard to allow for reach adjust with no drawbacks is blowing it

Every bike should be 56/56

5
nskerb
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Kelso, WA US
10/23/2024 6:50pm

Is the scout dead? It isn't even on the Transition website. 

I would be sad, but also wouldn't blame them for killing it. I was a scout fanboy. I went with a Norco sight in 2020 because of reasons, but one of them was because they also had a dedicated 27.5 bike. I was still a hold out, but the next bike I buy will be 100% be a mullet. It still makes me sad and slightly nostalgic though. I remember when 27.5 felt like big monster truck awesome size. 

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Pappas717
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Port Washington, NY US
10/23/2024 7:02pm
nskerb wrote:
Is the scout dead? It isn't even on the Transition website. I would be sad, but also wouldn't blame them for killing it. I was a scout...

Is the scout dead? It isn't even on the Transition website. 

I would be sad, but also wouldn't blame them for killing it. I was a scout fanboy. I went with a Norco sight in 2020 because of reasons, but one of them was because they also had a dedicated 27.5 bike. I was still a hold out, but the next bike I buy will be 100% be a mullet. It still makes me sad and slightly nostalgic though. I remember when 27.5 felt like big monster truck awesome size. 

The memo to bike biz went out over a year ago. Dual 27.5 is dead except on XS or sm frames. But don't say anything till u get rid of your inventory. 

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2
Glory831Guy
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Santa Cruz, CA US
10/23/2024 7:06pm

One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've heard of many pro riders using these, but I'm not aware of any company currently selling them. 

5
jalopyj
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Concord, CA US
10/23/2024 7:15pm
Suns_PSD wrote:
I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach. The bikes need to offer 10mm of reach adjust...

I really dislike that 95% of size L's have a 475mm Reach and XLs have a 500m reach.

 

The bikes need to offer 10mm of reach adjust for those of us in between.

 

That said, the new Sentinel looks like an ideal AM rig to my eyes.

Splayleg wrote:

That’s why any new bike not running a 56/56 headset standard to allow for reach adjust with no drawbacks is blowing it

Every bike should be 56/56

Unless you’re running a straight steerer fork, even if you’ve got a 56/56 head tube, I think you’d need to run an external lower cup for a reach adj headset? I think that eliminates a lot of the benefits.

5
1
10/23/2024 8:03pm
Splayleg wrote:

That’s why any new bike not running a 56/56 headset standard to allow for reach adjust with no drawbacks is blowing it

Every bike should be 56/56

jalopyj wrote:
Unless you’re running a straight steerer fork, even if you’ve got a 56/56 head tube, I think you’d need to run an external lower cup for...

Unless you’re running a straight steerer fork, even if you’ve got a 56/56 head tube, I think you’d need to run an external lower cup for a reach adj headset? I think that eliminates a lot of the benefits.

What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to do 8 mm front and back with a straight. Fork and five mill front and back with a standard tapered fork  The only thing that offers more is that stupid ZS66 that a few companies use for E bikes for some reason.   

7
1
pinkrobe
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Revelstoke, BC CA
10/23/2024 8:24pm
One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've...

One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've heard of many pro riders using these, but I'm not aware of any company currently selling them. 

I don't know if you can get them aftermarket, but Rocky Mountain sold the 2019 (?) Pipeline/Instinct with a ~10mm crown spacer so you could switch front wheels and get the same geo. It sat under the crown race I think. I feel like it would be relatively easy to make one, but I am no engineer.

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jalopyj
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10/23/2024 8:29pm

Every bike should be 56/56

jalopyj wrote:
Unless you’re running a straight steerer fork, even if you’ve got a 56/56 head tube, I think you’d need to run an external lower cup for...

Unless you’re running a straight steerer fork, even if you’ve got a 56/56 head tube, I think you’d need to run an external lower cup for a reach adj headset? I think that eliminates a lot of the benefits.

What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to...

What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to do 8 mm front and back with a straight. Fork and five mill front and back with a standard tapered fork  The only thing that offers more is that stupid ZS66 that a few companies use for E bikes for some reason.   

You right. Got my facts twisted. 

2
metadave
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10/23/2024 9:20pm
One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've...

One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've heard of many pro riders using these, but I'm not aware of any company currently selling them. 

pinkrobe wrote:
I don't know if you can get them aftermarket, but Rocky Mountain sold the 2019 (?) Pipeline/Instinct with a ~10mm crown spacer so you could switch...

I don't know if you can get them aftermarket, but Rocky Mountain sold the 2019 (?) Pipeline/Instinct with a ~10mm crown spacer so you could switch front wheels and get the same geo. It sat under the crown race I think. I feel like it would be relatively easy to make one, but I am no engineer.

That was actually a ZS and EC cup set that you would swap out, pretty easy to do with a new lower cup if you can get the right ones. But that was also for a 29/27.5+ wheel mix which are close to the same size, so you might need a bit more to get something from it. 

2
ShapeThings
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Emeryville, CA US
10/23/2024 9:22pm
What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to...

What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to do 8 mm front and back with a straight. Fork and five mill front and back with a standard tapered fork  The only thing that offers more is that stupid ZS66 that a few companies use for E bikes for some reason.   

Who makes a tapered steerer compatible reach adjust ZS56/56? Work components only offers a ZS56 top, EC56 bottom for 1.125x1.5 tapered. They have reach adjusts for ZS56/66 and a ZS56/56 for 1.125 steerers. 

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kperras
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10/23/2024 9:50pm
What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to...

What are you talking about? The zero stack 56 headset all allows for the largest room of any headset that’s available.  You should be able to do 8 mm front and back with a straight. Fork and five mill front and back with a standard tapered fork  The only thing that offers more is that stupid ZS66 that a few companies use for E bikes for some reason.   

Who makes a tapered steerer compatible reach adjust ZS56/56? Work components only offers a ZS56 top, EC56 bottom for 1.125x1.5 tapered. They have reach adjusts for...

Who makes a tapered steerer compatible reach adjust ZS56/56? Work components only offers a ZS56 top, EC56 bottom for 1.125x1.5 tapered. They have reach adjusts for ZS56/66 and a ZS56/56 for 1.125 steerers. 

You cannot adjust the lower bearing position fore-aft in a tapered 1.5, ZS56 cup. There is 0 room for that. 

You can adjust the reach by a total of 10mm in a ZS66 cup.

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TEAMROBOT
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10/23/2024 10:04pm Edited Date/Time 10/23/2024 10:12pm
One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've...

One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've heard of many pro riders using these, but I'm not aware of any company currently selling them. 

You mean something like this? Not sure why you'd want to make a 29" fork even taller for a 27.5" front wheel, as it's already 20mm taller than an equivalent 27.5" fork. But if you did, Reverse Components has you covered: https://reverse-components-usa.com/collections/headsets/products/reverse-angle-spacer

 

[EDIT: Wolf Tooth used to make one too that pressed into the lower headtube, but it's discontinued now. Probably because it's pretty sketchy. Specialized famously shipped their first gen 650b Stumpjumper with an extended lower headset cup as well, because it was a repurposed 29" front triangle).

6
Primoz
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SI
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10/23/2024 10:07pm
One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've...

One of the millions of companies selling billet pedals and stems should start selling spacers for 29er forks that optimize geo for 27.5 front wheels. I've heard of many pro riders using these, but I'm not aware of any company currently selling them. 

TEAMROBOT wrote:
You mean something like this? Not sure why you'd want to make a 29" fork even taller for a 27.5" front wheel, as it's already 20mm...

You mean something like this? Not sure why you'd want to make a 29" fork even taller for a 27.5" front wheel, as it's already 20mm taller than an equivalent 27.5" fork. But if you did, Reverse Components has you covered: https://reverse-components-usa.com/collections/headsets/products/reverse-angle-spacer

 

[EDIT: Wolf Tooth used to make one too that pressed into the lower headtube, but it's discontinued now. Probably because it's pretty sketchy. Specialized famously shipped their first gen 650b Stumpjumper with an extended lower headset cup as well, because it was a repurposed 29" front triangle).

To keep the ground to headset distance the same, to keep the geometry of the bike the same. 

A 29 fork is taller, but so is the axle compared to the ground. Putting a 27" wheel in a 29er fork will still drop the front end. 

5
Marcus J
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SE
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10/23/2024 11:32pm Edited Date/Time 10/23/2024 11:35pm

A standardized (blasphemy!) oval'ish headset standard would be awesome that give +-10mm reach/lots of angle adjust

14
bikelurker
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Bilbao, Vizcaya ES
10/24/2024 2:22am Edited Date/Time 10/24/2024 2:22am
Marcus J wrote:

A standardized (blasphemy!) oval'ish headset standard would be awesome that give +-10mm reach/lots of angle adjust

As if bikes aren't expensive enough already, with those pesky round interference holes in place. Sounds like a good idea but I suppose it would be very dificult to implement, because of distortion/alignement issues. We can't afford the quality needed for that, with bikes costing 10k already, as shitly made as most of them are.

8
j0lsrud
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NO
10/24/2024 3:18am
Marcus J wrote:

A standardized (blasphemy!) oval'ish headset standard would be awesome that give +-10mm reach/lots of angle adjust

bikelurker wrote:
As if bikes aren't expensive enough already, with those pesky round interference holes in place. Sounds like a good idea but I suppose it would be...

As if bikes aren't expensive enough already, with those pesky round interference holes in place. Sounds like a good idea but I suppose it would be very dificult to implement, because of distortion/alignement issues. We can't afford the quality needed for that, with bikes costing 10k already, as shitly made as most of them are.

Canyon has a neat solution for reach adjustment on the Sender/ Strive. To sets of headset "cups" so the reach is 0 or + - 5mm. It would also be easier to make angle sets etc.

Watch the video about reach adjustments here:

https://www.canyon.com/en-gb/customer-service/mountain/sender/#video=adjust-reach-sender-cfr-2023 

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