Belt drive fixed

Probably a stupid question, but how does gear inch calculation work on a belt drive?

Are the 'teeth' analogous to teeth on a chain drivetrain?

Oh, Oliver!

how come no- one has asked if they are good for skidz?

Because there's no need to.

YouTube- Fixie Inc belt drive fixed gear bike

where was the skidding ed? one backwards circle- bah.......

1:34 give you a pathetic little skid.

my dog could do better skids than that

my dog could do better skids than that

Is your Dog available to give me a few tips?

yeah prolly this sat-sun, could fit you in between siring duties (Dobermann) bring bones.

is it possible to buy the components separately ? i.e belt, chainring and cog ? if so what prices are they ? can't seem to find any reference to it at all.

Yes, phil wood made a beltring out of metal, but look like it'll be quite heavy.

And belt cog too by the look of it;

http://farm3.static.flickr.com/2659/4132025337_9cba288ec3.jpg

is there no way the belt could slide off the chainring or cog over time? it looks like there
is no guard to keep it from going sideways. I am really tempted to get a trek soho with the
alfine hub.

hmm, being Phil it'll cost a fortune. 2years down the line perhaps more cheaper versions perhaps ?

is there no way the belt could slide off the chainring or cog over time? it looks like there
is no guard to keep it from going sideways. I am really tempted to get a trek soho with the
alfine hub.

just buy it,
theyre fun, gave one a good ragging during the summer, at a festival, rode it all over the fields playing about. I was as sceptical as you, yet to hear reports of failures
(20 people instantly pop up saying how they just broke their necks after one failed on them........)

just buy it,
theyre fun, gave one a good ragging during the summer, at a festival, rode it all over the fields playing about. I was as sceptical as you, yet to hear reports of failures
(20 people instantly pop up saying how they just broke their necks after one failed on them........)

Ha good times. Same again this year? They've got the rides mentioned on their website already - saw details last week... it's down at the mo though?

no doubt man! totally there again, :-)

no doubt man! totally there again, :-)

nice one :)

is it possible to buy the components separately ? i.e belt, chainring and cog ? if so what prices are they ? can't seem to find any reference to it at all.

Yes, but they are very expensive.
http://www.g-boxx.com/e-carbondrive.html
Swapping and changing gears is bloody expensive. Luckily I have 46:24 on the SS 29r, so that when I build an Alfine rear to make the bike more versatile. I only need the alfine compatible 24t cog (the only size they do)

It also sounds like theres limited gear selections mainly because you need a certain size of rear cog that cannot be too small so getting a gear high enough for the track might be impossible.

Currently 60:20 is the highest.

Yes, phil wood made a beltring out of metal, but look like it'll be quite heavy.

Just IMHO obviously, but I dont like the PhilWood design. It doesnt allow for clearance of small stones etc. from the sprocket/beltring.

is there no way the belt could slide off the chainring or cog over time? it looks like there
is no guard to keep it from going sideways. I am really tempted to get a trek soho with the
alfine hub.

The sprocket has a ridge on the left, whereas the beltring has a ridges on the right. The belt itself is so rigid that it is unlikely to twist off these.

FYI

The Alfine ratios are....http://www.g-boxx.com/pdf/Gates/Carbon_drive-Shimano%20Nexus-%20Alfine%20Ratios.pdf

As well as fixed wheel bikes (and geared bikes) I love motorbikes and have been lucky enough in the past to have acquired a couple, a Honda VFR800 and a Harley Dyna Wide Glide. The Harley is belt drive and the belt has never caused a problem and as far as I am aware it has never needed tensioning. I'd suggest that this empirical evidence would mean that belt drive would be sufficiently strong on a bicycle.

On the other hand the chain on the Honda is included in every pre-ride check and often needs tweaking, a simple enough operation with an elliptical tensioning system but all the same...

Should a belt drive on a bike need tensioning, then elliptical bottom brackets as used in tandems could be one solution.

I think the market is pretty huge - single speed and hub geared which mostly is commuter/general purpose where dirty chains are not appealing.

I skimmed through the thread but didn't spot how gear ratios would be calculated in these systems, sorry if it was there, does any one know?

I skimmed through the thread but didn't spot how gear ratios would be calculated in these systems, sorry if it was there, does any one know?

Its exactly the same as with a chain.

As a side note. I had no problem tensioning the belt in my track ends (not actually track ends, as the are on a 135 spaced MTN bike). I just used the standard 'walking' method. Getting the beltline dialled in is in fact easier than with a chain, too. This because the belt is stiff and can move sideways. Turning the cranks allows the belt to straighten itself. You can then easily see if the sprocket and beltring are fully engaged.

@smallfurry - I suppose it must be - it's a ratio after all! Cheers N

Should a belt drive on a bike need tensioning, then elliptical bottom brackets as used in tandems could be one solution.

Not a bad idea as I have one on my Bad Boy due to it being single sped with disk brakes.

Once I gave a shit about this stuff and then I realised I was too lazy to fit anything new on my bike unless it was 1) the old piece was broken 2) I gave a shit.

Belt drives seem to fit into both.