new home-made gearbox bike thing

Dave_Camp
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Dave_Camp
Edited Date/Time 8/18/2014 11:10am
I finally finished my project bike... it rides pretty good!








The bike uses an 8-speed Shimano Alfine geared hub fit in between 83mm shell Saint cranks, a 20mm through axle front wheel as the rear wheel and tomicogs on the brake side of the hubs to drive the left side chain.

Geometry:
HA 64*
SA 75*
WB 46.5"
BB 13.5"
CS 17.3"
Weight: 44-45 lbs (using a bathroom scale)

more info and pictures here
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sspomer
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sspomer 12/8/2010 8:18am
12/8/2010 8:18am
love it! considering the tubing used, the weight doesn't seem too horrible,eh? yeah camp!
falconar
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falconar 12/8/2010 8:47am
12/8/2010 8:47am
Nice creativity. Any torque or bolt breaking issues with the rear cog and disc being bolt onto the same side of the hub?
tarka
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tarka 12/8/2010 9:30am
12/8/2010 9:30am
any advantage or disadvantage to using a 110mm wide hub on the rear?
EscapeArtist 12/8/2010 9:49am
12/8/2010 9:49am
" I do all machining in the garage with a 1940's Logan lathe and a nice hacksaw."

Hell yes. Great work man, I'm really impressed.
bturman
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bturman 12/8/2010 10:37am
12/8/2010 10:37am
Front wheel as a rear wheel? Pretty interesting. Worried about brake contamination from your chain lube? (I know I know, Camp doesn't need brakes . . . )
camdenthekid
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camdenthekid 12/8/2010 10:38am
12/8/2010 10:38am
i think his old one looked a little better but this thing is really rad and pretty amazing work
Dave_Camp
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Dave_Camp 12/8/2010 11:55am
12/8/2010 11:55am
Quote: Nice creativity. Any torque or bolt breaking issues with the rear cog and disc being bolt onto the same side of the hub?

-Not yet; the disc is in direct contact with the hub flange, so it should be good, and I haven't had any issues with the cog bending bolts or anything.


Quote: any advantage or disadvantage to using a 110mm wide hub on the rear?

-The advantages are that it is more narrow and won't catch rocks etc, it is light, and it is easily available (rather than go custom)... disadvantages being narrower spoke flanges, but the wheel is dished to be centered between hub flanges, so it should be plenty strong.


Quote: Thing is rad. Taking orders yet?!?!!!!

- thanks, but no. Hell no.


Quote: Worried about brake contamination from your chain lube?

-Yes. I just make sure to wipe off excess, and haven't had any issues yet.
thom9719
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thom9719 12/8/2010 12:27pm
12/8/2010 12:27pm
I got a chance to pedal it around last weekend. It's sick, the shifting works really well and it feels much lighter than 44 lbs. Camp killed it in our snow to dirt ride on the new bike. It sound awesome with the chain spinning through the air.

-KT
mtbmtbmtb
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mtbmtbmtb 12/8/2010 5:47pm
12/8/2010 5:47pm
how did you find out where to put the derauller and the brake mounts??????!?!?!
tarka
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tarka 12/9/2010 9:06am
12/9/2010 9:06am
mtbmtbmtb wrote:
how did you find out where to put the derauller and the brake mounts??????!?!?!
This design doesn't use a derailleur, hence "gearbox". The disc mount can be positioned from a simple template. I can't tell from the picture of this one if the mount is welded to the swingarm or bolted to a rail (which would allow for an adjustable position)...

Can you include a couple close-up shots of the moving bits of the bike (drivetrain front to back)? I would love to see more detail...
kyle10bike
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kyle10bike 12/9/2010 6:16pm
12/9/2010 6:16pm
Nice work Dave, It looks pretty good! Does it ride better than your previous ones?
el capitan
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el capitan 12/10/2010 7:33am
12/10/2010 7:33am
Looks great, would be cool to see you use a gates belt drive instead of the chain(would probably get past the whole chainlube on disc rotors issue).

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