Accessibility Widget: On | Off

new home-made gearbox bike thing

Related:
Create New Tag

12/7/2010 4:31 PM

I finally finished my project bike... it rides pretty good!


Photo

Photo

Photo

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

|

12/8/2010 8:18 AM

love it! considering the tubing used, the weight doesn't seem too horrible,eh? yeah camp!

|

12/8/2010 8:47 AM

Nice creativity. Any torque or bolt breaking issues with the rear cog and disc being bolt onto the same side of the hub?

|

12/8/2010 9:30 AM

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

|

BMA Film Festival coordinator

12/8/2010 9:47 AM

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

|

12/8/2010 9:49 AM

" 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.

|

12/8/2010 10:37 AM

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 . . . )

|

12/8/2010 10:38 AM

i think his old one looked a little better but this thing is really rad and pretty amazing work

|

12/8/2010 11:55 AM

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.

|

12/8/2010 12:27 PM

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

|

12/8/2010 1:53 PM

TWO WEEKS

|

12/8/2010 5:47 PM

how did you find out where to put the derauller and the brake mounts??????!?!?!

|

12/9/2010 9:06 AM

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...

|

BMA Film Festival coordinator

12/9/2010 6:16 PM

Nice work Dave, It looks pretty good! Does it ride better than your previous ones?

|

12/10/2010 7:33 AM

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).

|