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Lefty hub not spinning freely

mtbrider123mtbrider123 Posts: 99
edited May 2018 in MTB workshop & tech
Hi Guys,

My front wheel is not spinning freely for some reason. It’s not like there’s a lot of drag but there’s only a bit. Brakes are not rubbing. The rear wheel spins fine. Does anyone know what this might be?

I have a Cannondale F-Si (so a lefty suspension)

Thanks

Posts

  • 02GF7402GF74 Posts: 1,294
    If its not the brake disc dragging, it has to be bearings.

    If the fork should have one set of calliper lugs with gap, it is easy to undo calliper bolt to move the calliper clear of the disc, do that first.

    I can't think what else it can be as there is one bolt to hold the wheel on., no seals or anything else to get in the way.

    Remove the wheel and feel the bearing for stiffness and roughness. Bearing replacement is easy.

    As interim fix, prise off the seal, wash bearing with white spirit and pack with grease.
  • Bearings are perfectly fine and they’re quite new too. When I removed the wheel, there was dry grease and a bit of dust/dirt. After cleaning and re-greasing, and going for a ride, the wheel was still not spinning freely. Maybe that’s normal with a lefty?
  • 02GF7402GF74 Posts: 1,294
    Bearings are perfectly fine and they’re quite new too. When I removed the wheel, there was dry grease and a bit of dust/dirt. After cleaning and re-greasing, and going for a ride, the wheel was still not spinning freely. Maybe that’s normal with a lefty?

    Definitely not. They spin freely as any other bike wheel.
    Was one or both bearing replaced recently, one may be fitted out of square, the misalignment may be the cause.
    Or maybe the bolt for the front wheel is done up too tightly - the cap states the lb/ft figure but since I am not near my bike, I don't see why that would make a difference - you could try loosening the bolt a tiny amount to see if it makes any difference.

    It is common for wheels with sealed bearing to have a tube with shoulders that the inner race fits up against - this prevents excessive bearing preload - can't remember if there is one in the lefty hub but something to look into.

    what hub is it?

    define "not spinning freely" If the wheel has tyre fitted, and you pull it as fast as you can, how many turns do you get?

    and you have done this with the brake calliper out of the way?
  • 02GF74 wrote:
    Bearings are perfectly fine and they’re quite new too. When I removed the wheel, there was dry grease and a bit of dust/dirt. After cleaning and re-greasing, and going for a ride, the wheel was still not spinning freely. Maybe that’s normal with a lefty?

    Definitely not. They spin freely as any other bike wheel.
    Was one or both bearing replaced recently, one may be fitted out of square, the misalignment may be the cause.
    Or maybe the bolt for the front wheel is done up too tightly - the cap states the lb/ft figure but since I am not near my bike, I don't see why that would make a difference - you could try loosening the bolt a tiny amount to see if it makes any difference.

    It is common for wheels with sealed bearing to have a tube with shoulders that the inner race fits up against - this prevents excessive bearing preload - can't remember if there is one in the lefty hub but something to look into.

    what hub is it?

    define "not spinning freely" If the wheel has tyre fitted, and you pull it as fast as you can, how many turns do you get?

    and you have done this with the brake calliper out of the way?

    If it’s not supposed to be like that, then I also think it’s the bearings. The bike is at the shop right now but I’ll do a video of how the wheels spins, if they won’t be able to solve it. I’ve tried with callipers on and off, same thing. Wheels are bike ahead biturbo RS. They have their own hub
  • The RookieThe Rookie Posts: 27,747
    It can only be brakes or bearings.

    Some bearings are quite 'gloopy' (e.g. Hope) the extra grease should make them more reliable but also adds drag, without some objective way of looking at the 'drag' you have its hard to say if its normal or not. Cup and cone (kept up on the TLC) spin more freely than cartridge as a rule.
  • 02GF7402GF74 Posts: 1,294
    So was it the bearings?
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