Cassette / freehub resistance?

sibx

Hi there,

I've just installed a cassette for the first time. However, after installing the wheel back into the frame, I noticed that when I pushed the pedals round and left the wheel to spin, it slowed itself down rather quickly compared to the old wheel/cassette I had on. I timed the results with both, very roughly, but the difference is clear. For both tests I had the gearing at 53/12 and turned the cranks half a turn at a minimal force.

The old wheel/cassette spun round for roughly 43 seconds before coming to a complete stop.

The new wheel/cassette spun round for roughly 11 seconds.

Also when spinning, the freewheel noise sort of clicks/grinds louder for half to three-quarters of the rotation and the other 1/2 or 1/4 is much quiter. I've got an audio recording of this while I'll post in a little bit if it would be of help to hear it?

Is it a matter of greasing things or something else, or should the wheel be taken in for servicing/replaced?

Thanks for any help you might provide

Simon

nicklouse

just to clear. same hub?

what was the old cassette and what is the new one?

Does it shift well through all the gears?

try the old lock ring.

sibx

Sorry, forgot those details.

Its a completely new hub, Dura-Ace 7850. Not sure on the exact model but the old hub was stock with my FSA RD-220 wheels.

Old cassette = Shimano 105, new one (on Dura-Ace wheel/hub) is Ultegra. Both 10-speed 12-27.

Do new hubs have a break-in period of sorts? I just remembered that another pair of wheels I had once had the same problem, although I had to return those wheels due to the spokes braking every few rides :shock:

The new hub is definitely 'tighter' at engaging it seems, so probably quicker to spin up to speed. Its only when coasting that the resistance occurs which makes me wonder if its just because they are new.

I'm not very technically minded :P

sibx

Also, here is the sound recording I made of the freehub noise while coasting. http://www.sibx.com/freehub.mp3

nicklouse

so new everything. let it bed in and sort itself out. if you can not feel any point of resistance ie: it is not catching anywhere, then it will be just the "newness".

sibx

Thanks, Nick.

I suspected it might be the case after I remembered the same issue occuring on my previous 'new' wheels.

nicklouse

for piece of mind slacken or remove the lock ring and see how it spins. It should be the same with the lock ring and with out. (caution without the lock ring cogs will move and ........... and, well you get the idea.

sibx

Yep its the same.

Thanks again for your help!

venusi

Interesting as I was planning on posting pretty much the same question.

My hubs? Dura Ace in a pair of 7850 C24 CL wheels.

It's really smooth, just doesn't run very freely. Strangley the front DOES run well and seems to have really low resistance. I also noticed the audible clicking (pawl engagement?) for only half the revolution when I first fitted them, though it's extremely quiet anyway. I was concerned enough to pop into Condor and check another pair and they're the same.

I suspect they'll improve with a few miles to bed in. This is certainly what the guys in Condor said when I mentioned it. I've done around 100 miles on them now and they "seem" to be loosening up and strangely the clicking has increased so it's now audible on nearly the full revolution.

The only "blemish" on an otherwise great wheelset.

nicklouse

to be loosening up and strangely the clicking has increased so it's now audible on nearly the full revolution.

Sounds like the grease is getting spread about as it should be.