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fixed gear and massive amounts of torque?(7 posts)

fixed gear and massive amounts of torque?hectolyte
Jan 15, 2004 8:58 AM
how well do fixed gear hubs hold up to torque? Also how well would the free side of a hub hold up to torque? I have no idea what the cog or free/hub interface is like and I would like some pictures or an explanation of how it works.

I am thinking about putting together a single speed trials bike and am considering using a fixed or free rear hub. I'd just like some input on if I should go a different route, or I'd be okay, and perhaps some hub recommendations. Thanks!
This is a typical example of what trials riders do.
the picturehectolyte
Jan 15, 2004 9:00 AM
pic
If a fixed gear hub will handle this guy, I think you're safeDave Hickey
Jan 15, 2004 9:43 AM
Most fixed hubs are really track hubs. Torque is not a problem. As for a freehub, a singlespeed cog with spacers with handle the same amount of torque as a cassette would.
that sounds bad thenhectolyte
Jan 15, 2004 10:05 AM
for instance, I currently run a 8 speed cassette on my trials bike. I have it on a King hub with a steel driveshell. The gear I use for trials has sheared the three pins that hold all the cogs and spacers together and sheared completely through the spline? on the hubshell so the cog now rotates. Or It did, but It cost some cash to fix it.
maybe if I used the cheapo suzue hub, and just think of it as a disposable item I have to replace every year, I'd be okay?
Do you want one wheel to do both?Dave Hickey
Jan 15, 2004 10:44 AM
Check out the track hubs at Businesscycles.com. If you want a flip/flop, you're going to need a BMX freewheel for single speeding. You'll probably strip the freewheel before the threads on the hub.

I'm confused regarding your cassette hub. It sounds like the hub body is fine and the cassette carrier is shearing. Does the cassette have an alloy carrier? That picture looks like a Dura Ace cassette. It uses ti or steel cogs attached to a lightweight alloy carrier. If so, replace the cassette with individual solid cogs and spacers.
Do you want one wheel to do both?hectolyte
Jan 15, 2004 11:17 AM
to clear up your confusion, the picture is just a recent pic floating around a trials forum. It's not my situation, just an illustration of what trials riders do to their drivetrains. I have the individual cogs and spacers, and had the problems I described.
I never thought about stripping the freewheel before the hub. That is probably a consideration.
Don't trials bikes use *really* small chainrings?FlatlandRoller
Jan 16, 2004 9:09 PM
That would increase the torque on the cogs. A lot. But it's not a problem with usualy road gearing 39-5? tooth chainrings. At least that's my theory....