A/C bearings v/s ceramic BB's used w/ RF Cinch cranks.- Mtbr.com
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  1. #1
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    A/C bearings v/s ceramic BB's used w/ RF Cinch cranks.

    A/C bearings v/s ceramic BB's used w/ RF Cinch cranks. Used on a single speed.
    I ride a lot but have 2 SS bikes so each gets ridden about 5-8x a month. Both bikes have RF Next cranks, so larger 30mm axles and smaller bearings in the outbound BB. I have never managed to keep a BB smooth for more than 6months. RF replacement BB are $50 so not too much. I recently tried Real World a/c bearings BB, it didn't last much longer for 2x the cost.
    Now I'm considering ceramic bearings.
    Do any SS riders have a BB they prefer with good durability?
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  2. #2
    Downcountry AF
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    You don't need ceramic, you want angular contact bearings. Wheels Manufacturing makes an excellent BB at a good price. That's what clydesdales use, that or Chris King which use the same style of bearing. Super durable, just service periodically and your good to go.
    Rigid SS 29er
    SS 29+
    Fat Lefty
    SS cyclocross
    Full Sus 29er (Yuck)

    Stop asking how much it weighs and just go ride it.

  3. #3
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    I run Chris King BB on my SS, have for years. Never any issues with the bearings. It seems like when i ran shimano, every 6 month s and they had to be serviced / replaced.
    Running XTR cranks.
    If you're lucky enough to be in the mountains,
    you're lucky enough.

  4. #4
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    RF bbs are crap, but I once saw an article on how to replace the bearings with higher quality ones. I run xtr with my RF Atlas, and haven't had issues. I'm about 210-215 in gear, and ride east coast techy stuff.

  5. #5
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    This thread made me check the Chris King offerings and I see they now have a Threadfit 30 BB for 30mm spindles and BSA threaded bottom brackets. I've been wanting to upgrade to the Next cranks, but didn't want to use the RF BB. Now to figure out how to justify a $600 upgrade (cranks plus BB)...

  6. #6
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    Race Face BB Bearings – Haydn Williams Blog

    Article on replacing your bearings. I need to buckle down and try this myself.

  7. #7
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    Do you purge your bearings with fresh grease with the CK tool?
    XTR cranks have the 24mm axle and better bearing interface by design.
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  8. #8
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    CK makes both a/c and ceramic for 5x the cost of the RF BB. If it actually last 5 years it will be worth it. I'm sure CK will honor their warranty and most likely rebuild/replace the bearings. Their BB grease tool would help too I'm sure.
    Maybe I'll just get them.
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  9. #9
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    I've already ordered and will replace bearings on the Real World BB that had a/c bearings that failed. I'll replace with Enduro ceramic.
    My other BB will be replaced with CK.
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    #1gearallyear #Iridemtn

  10. #10
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    Is it just me or does it seem that the CK BB grease injection tool is worthless? It would be nearly impossible to purge grease into the bearings with seals blocking 99% of the entry. Removing the seals would be much more effective but you could damage them and need a new set of seals. Futhermore if your digging into your bearing you might as well just clean them, blast them dry and put fresh grease with a regular grease injector and your finger. Just my thoughts
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    #1gearallyear #Iridemtn

  11. #11
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    The HOPE cranks are nice and have a better BB with larger bearings. They're just not carbon nor as light.
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