Belt drive fixed

phew... glad that torque/motorcycle bit seems to have petered out.

im putting together a fixed gear belt drive bike pretty soon here. i didnt like any of the hub options out there for using a single speed one, so i decided to make my own rear cog. anyways, ive got a solid model i can upload to the site if anyone would like, so they can make their own too (or have someone do it for them). it mounts on a six bolt IS disk brake flange.

** note: requires a CNC

Is it designed to shed foreign objects?

I always felt the lack of holes on the Phil version could collect stones and grime in the channels, and wear the belt. The Gates cog is heavily machined and sheds crap well.

2010 Trek District on its way...when Madison FINALLY get the new 11 spd Alfine hub/shifter theyll be introduced...will run it flat bar until the rumoured/mythical Shimano 11 spd sti drop shifter is available...

(i used to sell BMW motorbikes...the belts on the F800s/st models were rated at 25,000 mile lifespan (from memory)...and were due for tensioning IF required at the 6000 mile service intervals)

yeah, i copied the design from the gates model, so it has essentially the same design as they do, in every way except the way that its mounted, mine has 6 flathead screws to hold it on. also, i got mine normally anodised, whereas they use some special gritty anodising. (i bought my chainring)

i was talking to the guys at gates for a while 6 months to a year ago, about a fixed version of their rear cogs, and they said it was on the way, even showed me pictures! but theyre using the standard thread on kind. aluminum on aluminum = XP imo...

only one more post to go!

actually, i never saw those phil cogs before, but i guess what i would do now, knowing they exist, and if i didnt have access to a CNC, is buy one of those and just put it on a lathe and cut out the inside of it with a o-ring groove cutting tool until there are some holes between the teeth where there should be. i wonder why phil doesnt... maybe its patented?

i got mine normally anodised, whereas they use some special gritty anodising. !

Unless they've changed them since I got mine. They are made from a reinforced thermosetting plastic. So are'nt anodised at all.

Sounds like an interesting project, keep us posted.

2010 Trek District on its way...when Madison FINALLY get the new 11 spd Alfine hub/shifter theyll be introduced...will run it flat bar until the rumoured/mythical Shimano 11 spd sti drop shifter is available...

There's an 8 speed brake shifter out already for a while, won't be long for the 11 speed version.

There's an 8 speed brake shifter out already for a while, won't be long for the 11 speed version.

Planet-x are putting then on the pompino. Cant remember if they are also selling them separatly.

Planet-x are putting then on the pompino. Cant remember if they are also selling them separatly.

that's for the 8 speed versa or flat bar style whcih is 11 speed - no drop bar 11 speed version available yet.... also £175 for the 8 speed! makes my Jtek shifter seem cheap

£175 is a normal price for an ergoshifter lever that work with internal hubs really.

What I don't like about the Versa is that you have to push the shifter really far in in order to change gear rather than a swift shift, and of course you can't just skip a couple gear down.

Either the mechanic at work didn't adjusted it properly or it's normally like that.

Oh the Moulton is divine to ride, stupidly light (for what it is) with the belt, loved it, S2C take a while to get used to though.

I dislike the suspension, but after a while I end up loving them as it soak up the road a lots better than tyres can ever do, and it doesn't feel like I'm wasting my energy when accelerating.

With a fixed wheel drive, it'll be perfect.

Oh the Moulton is divine to ride, stupidly light (for what it is) with the belt, loved it, S2C take a while to get used to though.

I dislike the suspension, but after a while I end up loving them as it soak up the road a lots better than tyres can ever do, and it doesn't feel like I'm wasting my energy when accelerating.

With a fixed wheel drive, it'll be perfect.

Very clever bikes. The small wheels accelerate quickly, while the slight suspension compensates for the fact that they react more to uneven roads than bigger wheels.

Always wanted to own one. Not sure how I'd justify it though.

It is, it feel spongy at first, but after a while when you start 'syncing'* with the bike, it feel perfect, the 20" wheel wasn't awkward to ride too.

*not sure how else to describe it as.

ive liked the look of those moultons for a while. theres a guy on the festival circuit who rides on old SS one between festivals with touring gear. he loves it but i have no idea how he can ride it so far and up difficult hills.

is there issues with the large belt ring rubbing the chainstay on track frames? i really want an belt drive 11 speed on a fast track bike.

ive liked the look of those moultons for a while. theres a guy on the festival circuit who rides on old SS one between festivals with touring gear. he loves it but i have no idea how he can ride it so far and up difficult hills.

is there issues with the large belt ring rubbing the chainstay on track frames? i really want an belt drive 11 speed on a fast track bike.

Possibly, the belt ring is very wide.

This newer version might help when/if it comes out.
http://www.bikerumor.com/2010/09/15/gates-carbon-drive-introduces-new-lighter-centertrack-system/

Did not like that one bit.

Can't imaging how painful it is if your ankle touch the tooth slightly.

Yes I am aware that the normal chainring have tooth, but they don't stick out horizontally like that Gates one.

is there issues with the large belt ring rubbing the chainstay on track frames? i really want an belt drive 11 speed on a fast track bike.

Well, most belt drive bike I've seen usually have a 130-135mm spacing to compensate and a dimple chainstay, on an old track frame with 120mm spacing design for skinny chainring, it might be a bit of a problem.

The belt will be covering it Ed. Am I missing something?

Someone on the Bikerumor link mentioned a chevron design, to take care of the centering, which sounded clever to me.

Got the last piece of the jigsaw for my belt drive project. Mmmmm.

](http://img831.imageshack.us/i/pwcustomflipflop.jpg/) Uploaded with ImageShack.us[/IMG]

fixed/freewheel?

that sound pretty awesome, what the whole plan with your belt drive build?

Nice looking hub set-up. What is the belt tensioning system on your bike?

I find the belt system is far more sensitive to tension than a chain, and took a while to dial it in. If your flipping your wheel while out and about. You may find it a bit of a task. If you have horizontal drop-outs, I'd recomend chain tugs.

Still. Very nice. Cheers for sharing.

20 teeth fixed and a White industries 20 teeth freewheel on the other side. I'm using a bonded Alan frame I picked up in Holland and got into the back triangle through the bolted brake bridge.

Wheels are Ghisallo wooden rims with a Campy Delta brake on the front using cork brake pads. The seatpost and handlebars are made of walnut and i've got a gorgeous Gilles Bertauld saddle. I was also thinking of using clear acrylic poles for the seatpost and handlebars so it looks like the saddle is just floating in the air. I'm a teacher and i've been using the DT department to test it all out. Both the wood and acrylic will take far more stress that you would think. I'm trying to get the bike in under 6-7kg

My only worry is that the frame will have quite a bit of flex at the back, but if that happens I'll have a frame made up specially for the project. I'm getting married in 2 months so this is possibly the last money I will get to spend on myself. It'll probably just go on the wall!

The bloke who got my Hinde Lo Pro stolen has finally paid me all that he owed so have a little more to play with. It's taken 18 months of planning and waiting for various parts to become available, but fingers cross will be built before May.

As soon as it's built I'll get some pictures up.

I think the best solution if you get a frame especially for this project would be one with an EBB. The belt needs a surprising amount of tension, but once thats dialled in, its obvious (buttery smooth).

£175 is a normal price for an ergoshifter lever that work with internal hubs really.

What I don't like about the Versa is that you have to push the shifter really far in in order to change gear rather than a swift shift, and of course you can't just skip a couple gear down.

Either the mechanic at work didn't adjusted it properly or it's normally like that.

Updated: at work, someone have the On-one Pompino with the Versa shifter, apparently it's a newer one that shift better (doesn't required a long push to change gear) and the downshift is on the left side instead of the right side (of the right levers), it's actually easier and better than the original one I've tried, so now I'm convinced that the Versa is a worthly hood levers to use with the Alfine.

Apparenty there's a VSR-11 one out already but somehow hard to find (for Alfine 11).

Updated: at work, someone have the On-one Pompino with the Versa shifter, apparently it's a newer one that shift better (doesn't required a long push to change gear) and the downshift is on the left side instead of the right side (of the right levers), it's actually easier and better than the original one I've tried, so now I'm convinced that the Versa is a worthly hood levers to use with the Alfine.
Apparenty there's a VSR-11 one out already but somehow hard to find (for Alfine 11).

Nice!

That'll be my next project after the roadie.

Hub geared, disc braked, rear racked, CX/commuter. Might need to think a of a more snappy name for it though.

Does anyone offer services for modification of carbon frames to fit a belt drive? I quite like the picture of the rear dropout which was split in half, which might work for a carbon bike since the dropouts are still metal. Or even better, the one which sliced the dropout to half it's thickness for each of the arms of the triangle.