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Project Shredmaster 2020 - Selfmade Gearbox Frame 41

4491 of 17526
(81 people)
Shredmaster_2020
12/11/2020 7:21am
s1600 Shredmaster 2020 FB
s1600 AZO00455mod1
s1600 AZO00487mod1
s1600 AZO00590mod1
s1600 Geo
s1600 Shredmaster 2020 FB
c90 Shredmaster 2020 FB c90 AZO00455mod1.jpg?VersionId=q.7fRhA77PVQdPESWLbpj c90 AZO00487mod1.jpg?VersionId=qlN5hYBpnP c90 AZO00590mod1 c90 Geo.jpg?VersionId=f5fNmK2slP5 YEo2KBpbToaqL8InhQ
Related:
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EXT
RockShox
Pinion
Gearbox
Self-Made
Maxxis
Parts
Brand
Model
Additional info

Parts

Frame
Other
Shredmaster 2020
Selfmade
Frame: Other Shredmaster 2020. Misc: Selfmade
Rear Shock
EXT
Arma HBC
Rear Shock: EXT Arma HBC
Fork
RockShox
BoXXer Ultimate 2020
Fork: RockShox BoXXer Ultimate 2020
Headset
Cane Creek
Headset: Cane Creek
Handlebar
Reverse Components
RCC 810
Handlebar: Reverse Components RCC 810
Stem
FSA
Gradient
Stem: FSA Gradient
Grips
ESI
Extra Chunky
Grips: ESI Extra Chunky
Brakes
Magura
MT5
Brakes: Magura MT5
Brake Levers
Shimano
Xt
Brake Levers: Shimano Xt
Shifters
Other
Pinion
Shifters: Other Pinion
Front Derailleur
Other
Pinion
Front Derailleur: Other Pinion
Rear Derailleur
Other
Pinion
Rear Derailleur: Other Pinion
Cranks
Other
Pinion CNC
Cranks: Other Pinion CNC
Chainrings / Sprocket
Other
Pinion
Chainrings / Sprocket: Other Pinion
Chain
Other
Chain: Other
Cassette / Rear Cog
Other
Pinion
Cassette / Rear Cog: Other Pinion
Pedals
Xpedo
Trident
Pedals: Xpedo Trident
Front Rim
Other
Newmen EG 30
Front Rim: Other Newmen EG 30
Rear Rim
Other
Newmen EG 30
Rear Rim: Other Newmen EG 30
Hubs
Other
Pro4 / Pinion H2R
Hubs: Other Pro4 / Pinion H2R
Spokes
Sapim
Spokes: Sapim
Front Tire
Maxxis
Minion DHR II 2.4 DH
Front Tire: Maxxis Minion DHR II 2.4 DH
Rear Tire
Maxxis
Minion DHR II 2.4 DH
Rear Tire: Maxxis Minion DHR II 2.4 DH
Saddle
SDG
SDG I-FLY 2.0
Saddle: SDG SDG I-FLY 2.0
Seatpost
SDG
I-Beam Alloy
Seatpost: SDG I-Beam Alloy
Seatpost Clamp
Nukeproof
Seatpost Clamp: Nukeproof
General Info

General Info

Model Year
2020
Model Year:
2020
Riding Type
Downhill
Riding Type:
Downhill
Weight
39 lb 7.4 oz (17900 g)
Weight: 39 lb 7.4 oz (17900 g)
Additional Info

Weight incl. pedals.

Can be ridden as a Full 29er or Mullet, same geo via flipchip

For the interested reader: we'll add some more insights soon Smile

https://www.instagram.com/sir_shredmaster/

Additional Info:

Weight incl. pedals.

Can be ridden as a Full 29er or Mullet, same geo via flipchip

For the interested reader: we'll add some more insights soon Smile

https://www.instagram.com/sir_shredmaster/

Shredmaster_2020
12/11/2020 7:21am
4491 of 17526
41 comments

View replies to: Project Shredmaster 2020 - Selfmade Gearbox Frame

c50 water avatar 1607028280
haen
4 years ago
Perfect. Would be a dream to build a bike like this. Any recs for how to get started?
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IBC
4 years ago
Very cool! Looks well thought out, well put together & solid - if not a tad heavy. Bet it's an absolute blast to ride 👍
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Shredmaster_2020
4 years ago
Thx!

It's the 6-Gear Version with 295% range. Pretty much the same Range as a SRAM DH 7-Gear Setup.

The reason for the Gearbox was first of all less unsprung weight on the rear wheel (about 450g),
which makes the suspension more active and supple / plush. Which is the whole point of a DH-Bike suspension i'd say.

The weight also sits perfectly low in the frame and makes the bike feel super planted and stable (low center of gravity).

No derailleur to rip off, super low maintainance, always perfect chainline, no cassette to clog with mud, etc. is also quite nice


I do not intend to pedal it uphill ever, or any other bike ^^
13
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Philip_Rossetti
4 years ago
Haha yeah I get what you mean! Pedalling sucks did you buy the tubes off the shelf and weld it yourself or did you get someone to do it? I heard Aluminium is tricky to weld?
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Philip_Rossetti
4 years ago
I like it! It reminds me of the Raaw Madonna! But may I ask what the point is of a pinion gearbox on a Dh bike? Those things have something like 600% of range? Do you put a dropper on it and pedal it uphills too?
1
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TEAMROBOT
4 years ago
That's amazing. The bike just looks ridiculously clean and tidy for a home project. Who welded it? As I understand it, welding aluminum frame tubes is significantly harder than welding steel. I guess the biggest benefit is that machine time goes way down for making all the bits and bobs out of aluminum instead of steel. I have a friend who made a steel gearbox downhill bike and it seems like he spent a whole year on the mill making junctions and braces and pivot locations.
4
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Shredmaster_2020
4 years ago
We didnt know Ingo personally, we just conacted him

Tubes came from: Zonenschein, Wowbike and Huahsines.

About dimensioning, well Peter has an engineering backround and we got recommendations from Kavenz bikes and others. And then we mostly added a bit on top
1
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Craw
4 years ago
It's a tensioner for the gearbox. Gives it a really nice tidy symmetrical look.
2
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Shredmaster_2020
4 years ago
We bought the tubes all over the place, wherever we would get them :D

Welding was done by a professional welder, including heat treatment afterwards. Because yeah, you need to know what you are doing, when welding aluminium, and i dont
3
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Primoz
4 years ago
Where did you get the tubes if it's not a secret? And do you know Ingo or did you just contact him out of the blue? When you say Linkage, how did you do dimensioning of the tubes and stuff to make sure the bike holds up?
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Zayphod
4 years ago
High pivot 29er with a gear box. Holy shit.
This is everything a DH bike needs. I bet it murders!
2
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Shredmaster_2020
4 years ago
Yeah, we went save, especially on the chain- & seatstays in terms of wall thickness.

But i'm pretty happy with the overall weight of 17,9 Kgs.

There is no Carbon on the bike (except the handlebar), the rims are amongst the strongest on the market, the tires are true DH-Casings and no air shock.

First ride was quite a blast
2
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Kolodzilla
4 years ago
Checks all the boxes! Nice to see HPP, gearbox and durability over weight - all put together into such a neat package.
1
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jezken
4 years ago
About as well as Eagle does if you try shift it under full load. Shifting is best done a pinion in the deadspot of pedal stroke - timing becomes natural pretty quick.
1
c50 IMG 20211027 155910 1655061393
Primoz
4 years ago
Geezus fucking tapdancing christ, self made??? This looks production ready!!
2
c50 AZO00590mod1 1607594663.jpg?VersionId=.v.KBz4tSFOqhCkVvQ.gQSrO
Shredmaster_2020
4 years ago
The welding (and heat treatment) was done by Ingo Müller.
He is also welding the Kavenz Bikes for example. I'd say he's pretty good
3

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