Rotor ceramic PF4130 friction
Moderator: robbosmans
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Hello, new to this forum.
I did a dry fit of my new bearings and crank last night on my current bike build. Before install I noticed the bearings seemed to have allot of resistance. Is this because they are new and require break in? Too much grease?
Spin test with crank only gave me about 1.5 revolutions. I watched the Ceramicspeed install video of their PF4130 and after install it spun quite freely with very little resistance. Hawk Racing also has a video showing 10-15 revolutions for their BB.
Any input is appreciated.
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I did a dry fit of my new bearings and crank last night on my current bike build. Before install I noticed the bearings seemed to have allot of resistance. Is this because they are new and require break in? Too much grease?
Spin test with crank only gave me about 1.5 revolutions. I watched the Ceramicspeed install video of their PF4130 and after install it spun quite freely with very little resistance. Hawk Racing also has a video showing 10-15 revolutions for their BB.
Any input is appreciated.
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might be grease - how much is applied is really a matter of usage/choice
but 1.5 rev is not much, i pack my bearings full as they get exposed to a lot of wet rides and water in the bb shell, even then i get about 4 revs, over time it goes up as grease is lost
if you use oil or light grease, you get a lot more revs, that may explain the numbers in the demonstrations
have you checked the bearing seals? a crooked seal can add a lot of drag to a bearing
but 1.5 rev is not much, i pack my bearings full as they get exposed to a lot of wet rides and water in the bb shell, even then i get about 4 revs, over time it goes up as grease is lost
if you use oil or light grease, you get a lot more revs, that may explain the numbers in the demonstrations
have you checked the bearing seals? a crooked seal can add a lot of drag to a bearing
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Should I take off the seals and repack them myself with something lighter? These are Rotors ceramic with white grease in them.
They weren't cheap but not too terribly pricey either. When I spun them by hand they both felt sluggish compared to the FSA cups (new) that were in there when I bought the frame.
I'm at a loss here atm.
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They weren't cheap but not too terribly pricey either. When I spun them by hand they both felt sluggish compared to the FSA cups (new) that were in there when I bought the frame.
I'm at a loss here atm.
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I spoke with Rotor and was informed that the PF4130 bearings have more drag than 24mm bearings due to the fact that they have double rows of bearings as opposed to the 24's having just one row. They also require more grease as a result.
The double rows are necessary because of the space needed to accommodate the 30mm spindles.
May have to look for an alternative. Maybe Ceramicspeed would be a better option. Not too many manufacturers of the PF4130.
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The double rows are necessary because of the space needed to accommodate the 30mm spindles.
May have to look for an alternative. Maybe Ceramicspeed would be a better option. Not too many manufacturers of the PF4130.
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Give it some time and see what it looks like after 1000 miles. A brand new ultegra or DA BB86 f.ex. has a lot of drag, but it gets smoother and smoother as the miles add up. After 5000 miles, mine spins as freely as my superrecord TI crankkset (ceramic from factory)
Current bikes:
Scott Addict Premium Disc 2018
Scott Addict Orica Greenedge 2015
Retired:
Canyon Endurace CF SLX 2016
Canyon Ultimate CF SLX 2013
Scott Addict Premium Disc 2018
Scott Addict Orica Greenedge 2015
Retired:
Canyon Endurace CF SLX 2016
Canyon Ultimate CF SLX 2013
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Delorre wrote:Give it some time and see what it looks like after 1000 miles. A brand new ultegra or DA BB86 f.ex. has a lot of drag, but it gets smoother and smoother as the miles add up. After 5000 miles, mine spins as freely as my superrecord TI crankkset (ceramic from factory)
Thanks [emoji106]
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41mm shell plus 30mm spindle = dead bearings regardless lol.
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What about Ceramicspeeds coated version with 4yr warranty? I already have the Rotor 3D+, so no going back now.
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Should be the best option. If (and it's a big if) they'd warranty bearings that failed inside the 4 or 6 year period you might even say they're decent value.
However, note that the warranty terms contain the catch-all 'not subject to normal wear and tear, or lack of maintenance'. So they're not really saying that their bearings will last for years at all...
However, note that the warranty terms contain the catch-all 'not subject to normal wear and tear, or lack of maintenance'. So they're not really saying that their bearings will last for years at all...
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Thanks wingguy. I will definitely take that into consideration.
Thanks all for chiming in.
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Thanks all for chiming in.
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