Wait, you were serious? I was sure you were making fun of me for dragging Shimano in a Sram topic 😂
New Tech Rumor. SRAM has completed a hostile takeover of the Shimano Corporation. No wait. Shimano has fought back in the fourth round and seems ready to switch it up... Sorry Primoz.
New Tech Rumor. SRAM has completed a hostile takeover of the Shimano Corporation. No wait. Shimano has fought back in the fourth round and seems ready...
New Tech Rumor. SRAM has completed a hostile takeover of the Shimano Corporation. No wait. Shimano has fought back in the fourth round and seems ready to switch it up... Sorry Primoz.
I heard Huffy was swooping in last minute to buy both in a hostile take over move
I've actually been lucky enough to ride this bike, as well as the prototype Cedric built prior to this. The drivetrain works really well. As Matt Beer mentions in the article, blindfolded you would not be able to tell the difference in shifting quality between this and a conventional derailleur. I can also confirm that Cedric is a great guy and is genuinely looking to make the mountain biking experience better for everyone.
I've actually been lucky enough to ride this bike, as well as the prototype Cedric built prior to this. The drivetrain works really well. As Matt...
I've actually been lucky enough to ride this bike, as well as the prototype Cedric built prior to this. The drivetrain works really well. As Matt Beer mentions in the article, blindfolded you would not be able to tell the difference in shifting quality between this and a conventional derailleur. I can also confirm that Cedric is a great guy and is genuinely looking to make the mountain biking experience better for everyone.
awesome to hear. that second bike also looks very well refined for a second iteration prototype.
I've actually been lucky enough to ride this bike, as well as the prototype Cedric built prior to this. The drivetrain works really well. As Matt...
I've actually been lucky enough to ride this bike, as well as the prototype Cedric built prior to this. The drivetrain works really well. As Matt Beer mentions in the article, blindfolded you would not be able to tell the difference in shifting quality between this and a conventional derailleur. I can also confirm that Cedric is a great guy and is genuinely looking to make the mountain biking experience better for everyone.
I am stoked to see all these cool drive train ideas that have been presented lately. This one looks really promising and I am interested to see who they are working with on this. Looks like it is not Norco which would have been cool but could definitely see it being someone like Forbidden. Are they considered a "major MTB company" at this point?
Looks draggy, how does it compare to a pinion drive after 4 hours of dirt and dust?
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low. He's also using pretty large pulley wheels and a large idler, which further reduces drag.
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low...
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low. He's also using pretty large pulley wheels and a large idler, which further reduces drag.
Not convinced on the larger pully wheel thing tbh. Moving then derailer is quite the feat all the same 👍
It's about as draggy as a normal drivetrain is. The Pinion should be more draggy, as it has constant mesh gears, 6, 7 or 9 gear pairs (9, 12 or 18 gears, as it's a 2-stage gearbox, so 3x3, 3x4 or a 3x6 arrangement), all the bearings those gears require and any shifting mechanism rotating and moving with them. A Pinion does have the benefit of a straight chain, but everybody usually says you can feel the drag of a (invloute geartrain executed!) gearbox (involute part emans it would not apply to the Honda solution and/or Shimano patent).
As for large pulleys, the larger the better - the larger the pulley, the slower the bearing rotates as drag in bearings increases with rotational speeds increasing. Plus, the larger the pulley, the less chain links rotate and thus cause less frictional losses.
There's a reason Protour teams supported by Sram pushed for an 11-x cassette with standard front rings as opposed to the 10-x cassettes, that enabled Sram to use smaller front rings, the 10T is so small, the losses increase and you're closer to the polygon effect rearing up its ugly head.
As for bearing losses, bike drivetrain rotational speeds are somewhat low, though with road bikes, if you're pedalling at 90 rpm in the 50-ish tooth front chainring, the 10-ish derailleur pulley will rotate at ~5-times the rotational speed of the cranks. So at roughly 400 to 500 rpm. And that's not that low anymore. With mountainbikes we're at more of a 2 to 3 ratio (30-ish teeth on the front chainring, 10 to 15 tooth pulley gears), so we're in the 250-300 rpm range. Increase that to a 20T pulley and you're in the 125 to 150-ish range.
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low...
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low. He's also using pretty large pulley wheels and a large idler, which further reduces drag.
does it get a lot of chain slap? the PB article mentioned how quiet it is, i'd guess no despite seeing the chain move around a bit in the video, but am curious on your first hand impressions.
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low...
It's actually not draggy. By having the same chain tension in all gears, the drag in the larger cogs (where you'd notice it) is quite low. He's also using pretty large pulley wheels and a large idler, which further reduces drag.
does it get a lot of chain slap? the PB article mentioned how quiet it is, i'd guess no despite seeing the chain move around a...
does it get a lot of chain slap? the PB article mentioned how quiet it is, i'd guess no despite seeing the chain move around a bit in the video, but am curious on your first hand impressions.
Anyone know what this proto-looking tire on Myriam Nicole's bike is? A Schwalbe Magic Mike?
[img]https://p.vitalmtb.com/photos/forums/2021/11/19/11628/s1200_Screenshot_20211112_191520_01.jpg[/img]
Anyone know what this proto-looking tire on Myriam Nicole's bike is? A Schwalbe Magic Mike?
Those side knobs look very Minion inspired which hasn't been seen in Schwalbe line up to date. Any chance the team has a new tire sponsor ?
I feel like this might already be in here like 20 pages back, but in case it's not here you go.
[img]https://p.vitalmtb.com/photos/forums/2021/11/19/11629/s1200_e13tire.jpg[/img]
I feel like this might already be in here like 20 pages back, but in case it's not here you go.
I may or may not have been gifted one of these tires and may or may not have a couple hundred miles on it already. Casing construction is stiff, but not too stiff. I only have Specialized tires to compare it to and it sits in between the grid trail and grid gravity. 2.5", but on the narrow side. Rubber compound seems good, little to no signs of wear so far. Never weighed it, I would guess 1,000-ish grams. Tread pattern works well, I can give it the best compliment I can give any tire which is I simply forget about it. It just works and doesn't have any quirky issues. I was told "soon" on the, release date... That was 2 months ago.
https://www.vitalmtb.com/videos/member/A-Better-Derailleur-Supre-Drive-…
In all seriousness, that looks pretty amazing.
edit: there's a mini interview w/ him over on that other site. he mentioned his first mountain bike was a norco.
As for large pulleys, the larger the better - the larger the pulley, the slower the bearing rotates as drag in bearings increases with rotational speeds increasing. Plus, the larger the pulley, the less chain links rotate and thus cause less frictional losses.
There's a reason Protour teams supported by Sram pushed for an 11-x cassette with standard front rings as opposed to the 10-x cassettes, that enabled Sram to use smaller front rings, the 10T is so small, the losses increase and you're closer to the polygon effect rearing up its ugly head.
As for bearing losses, bike drivetrain rotational speeds are somewhat low, though with road bikes, if you're pedalling at 90 rpm in the 50-ish tooth front chainring, the 10-ish derailleur pulley will rotate at ~5-times the rotational speed of the cranks. So at roughly 400 to 500 rpm. And that's not that low anymore. With mountainbikes we're at more of a 2 to 3 ratio (30-ish teeth on the front chainring, 10 to 15 tooth pulley gears), so we're in the 250-300 rpm range. Increase that to a 20T pulley and you're in the 125 to 150-ish range.
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