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Discussion Starter · #1 · (Edited)
Cranks move as I walk the bike down driveway

Cannondale CAAD 10 with replaced bottom bracket/crank due to ongoing issues with BB30. Bike rides and shifts perfectly. After this repair (sorry, do not have the info on what components were used) I notice that as I walk the bike, the cranks turn. None of my other bikes do that.

Just curious as to why this might be happening. SRAM Rival cranks replaced Red as part of the repair.

No plans to do anything about this, other than ride!
 

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Cannondale CAAD 10 with replaced bottom bracket/crank due to ongoing issues with BB30. Bike rides and shifts perfectly. After this repair (sorry, do not have the info on what components were used) I notice that as I walk the bike, the pedals turn. None of my other bikes do that.

Just curious as to why this might be happening. SRAM Rival cranks replaced Red as part of the repair.

No plans to do anything about this, other than ride!
When you say "the pedals turn" do you really mean that the cranks turn? If that is the case it is caused by friction in the freehub being greater than friction in the BB. Assuming the BB is not loose, this is not an issue unless the freehub friction causes the chain to droop when coasting.
 

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I believe this is usually a sign of the freehub bearings reaching the end of their life. Though it does seem like a strange coincidence that this only started happening after you changed the BB and crankset.
 

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'brifter' is f'ing stupid
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Try removing your freehub and giving it a good soaking.
Wow...you're full of good advice. You have no idea what kind of wheels the OP has, thus you have no idea whether 'soaking' the freehub will help or hurt. Nor did you explain how to soak it or what to soak it in. Just stop w/ the bad advice.

OP: Do you have Mavic wheels? If so, which model?
 

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Though it does seem like a strange coincidence that this only started happening after you changed the BB and crankset.
No it doesn't seem strange at all. We're not talking very much force at all here. The old bb would have had enough friction to prevent turning while the new one is nice and free so turns.

OP, it may be as simple as a little grease, or whatever should be used for your hub, on the pawls. That would be my first try.
Lift up you bike and turn the cranks backwards. If the wheel turns it's the pawls most likely. Almost all wheels can be made to turn a little by doing that but I think you'll instinctively know how much is too much.
 

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Wow...you're full of it. You have no idea what kind of wheels the OP has, thus you have no idea whether 'soaking' the freehub will help or hurt. Nor did you explain how to soak it or what to soak it in. Just stop w/ the bad advice.
Fixed.
 
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No it doesn't seem strange at all. We're not talking very much force at all here. The old bb would have had enough friction to prevent turning while the new one is nice and free so turns.
True. I stand corrected. :)
 

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Discussion Starter · #11 ·
Sorry, been away for a few days! I do have Mavic Ksyrium wheels, the same wheels that came with the bike. I will try lifting the bike and turning the cranks backwards to see what happens. Based on advice above, freehub bearings or pawls most likely culprits. When the riding season winds down, I will have it looked at. Appreciate the advice.
 

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'brifter' is f'ing stupid
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Sorry, been away for a few days! I do have Mavic Ksyrium wheels, the same wheels that came with the bike. I will try lifting the bike and turning the cranks backwards to see what happens. Based on advice above, freehub bearings or pawls most likely culprits. When the riding season winds down, I will have it looked at. Appreciate the advice.
Not the bearing, singular as there is only one. Not the pawls. It's the bushing on the inboard side of the freehub. It dries out and needs to be cleaned and lubricated. This is one of the worst designs in the whole industry. Luckily it's very easy to service, and it should be cleaned/lubed every couple thousand miles...I think Mavic recommend every 1000 or something like that. I would have it done sooner rather than later as it does wear quickly once the oil dries up. Yes, oil. Do NOT use grease. Mobil 1 works great, but any medium weight oil is fine.
 

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Not the bearing, singular as there is only one. Not the pawls. It's the bushing on the inboard side of the freehub. It dries out and needs to be cleaned and lubricated. This is one of the worst designs in the whole industry. Luckily it's very easy to service, and it should be cleaned/lubed every couple thousand miles...I think Mavic recommend every 1000 or something like that. I would have it done sooner rather than later as it does wear quickly once the oil dries up. Yes, oil. Do NOT use grease. Mobil 1 works great, but any medium weight oil is fine.
Is there an instructional video for how to do this correctly?
 

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Is there an instructional video for how to do this correctly?
I do it the hard way:

1) Remove cassette
2) 5mm allen in DS axle end, Mavic bearing adjuster on the NDS, undo the bearing adjuster cap completely
3) Pull it off, that pulls off the NDS axle end
4) 10mm allen in the NDS axle, break it loose from the DS (which still has the 5mm allen in the end)
5) Remove axle (now in 2 pieces, black alloy piece from the NDS, silver steel piece from the DS
6) Carefully pull the free hub off the hubshell, be careful to keep track of the 2 pawls and springs, and the washer
7) Clean everything
8) I put my finger over the middle of the bearing in the free hub and pour whatever lube I'm using into the free hub
9) Replace the washer on the top of the pawl tower, replace the pawls/springs, then while compressing the pawls reinstall the free hub
10) Put the axle back in and tighten, using the 5mm allen install the bearing adjuster cover and tighten til it stops, then back off about 1/8 turn. Pop the NDS cap back in and you're done.

I'm sure you can find any number of videos on YouTube if you search for a few seconds.
 

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I wouldn't wait till the 'ride season winds down'. Those wheels need attention when they start malfunctioning or you'll end up with replacement of parts in lieu of service of parts.
 
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