advice for carbon crankset

[weightminimalist]

My current setup
Crankset: Shimano Alfine Hollowtech II , 170mm crank arm length, 130BCD, Single Speed 48T with integrated chainring guard
Bottom Bracket: Shimano Ultegra Press Fit sealed bearing unit BB92

I ride my bike to work but at a short distance every weekday.


For some reason, I must keep using the existing Shimano bottom bracket and just would like to upgrade crank arms, spider & chainring to carbon fiber for further weight reduction.

THM is very good but the price is insanely unaffordable.
Any recommendation for good quality options?

[ddddd1]

No carbon crankset for your bottom bracket: BB86 can be only used with 24mm spindle which afaik means only Shimano or Rotor (both aluminium). Shimano FC-R9100 is, in terms of weight, the best you can get with 24mm spindle.

[Marin]

Sram Force or Red with an adaptor.

[bmCube]

rotor 4130 will take a 3Omm crank. I have an easton ec90 powermeter (30mm axle, no bb30) in my bb86 frame, with the rotor 4130 bottom bracket and have no problems. But my understanding is that you can't/ won't change the bottom bracket.

[Erwin]

GXP carbon crankset or THM Origin with 24mm spindle is the way to go. 4130 bearings is not recommended by lots of people. Me included, also I have one bike bike with DUB crank in a BB86 frame. But is only a good weather climb bike.

[OnTheRivet]

GXP carbon crankset or THM Origin with 24mm spindle is the way to go. 4130 bearings is not recommended by lots of people. Me included, also I have one bike bike with DUB crank in a BB86 frame. But is only a good weather climb bike.

While certainly not ideal DUB spindles in a BB86 shell seem to work fine for me ass a 64kg person. Honestly not sure what weather would have to do with it as large bearing with bad seals will fail faster than a small bearing with good seals. As long as they are not being overloaded (heavy riders) I think the DUB/BB86 combo is fine, at least in my two bikes.

[ooo]

Shimano FC-7800-C
same 24 mm bb axle and 130 mm bcd

[weightminimalist]

Hi all, after I disassembled the crankset and measured it , I found the correct BB is BB92

[weightminimalist]

Shimano FC-7800-C
same 24 mm bb axle and 130 mm bcd

look nice, let me search about this.

[weightminimalist]

No carbon crankset for your bottom bracket: BB86 can be only used with 24mm spindle which afaik means only Shimano or Rotor (both aluminium). Shimano FC-R9100 is, in terms of weight, the best you can get with 24mm spindle.

Sorry that after I disassembled the crankset and measured it , I found the correct BB is BB92

[weightminimalist]

GXP carbon crankset or THM Origin with 24mm spindle is the way to go. 4130 bearings is not recommended by lots of people. Me included, also I have one bike bike with DUB crank in a BB86 frame. But is only a good weather climb bike.

Sorry that after I disassembled the crankset and measured it , I found the correct BB is BB92

[Karvalo]

For some reason, I must keep using the existing Shimano bottom bracket

For what reason?

[weightminimalist]

For some reason, I must keep using the existing Shimano bottom bracket

For what reason?

My bike is a folding bike with a folding hinge integrated into the bottom bracket BB92.

[Karvalo]

For some reason, I must keep using the existing Shimano bottom bracket

For what reason?

My bike is a folding bike with a folding hinge integrated into the bottom bracket BB92.

So what?

Are you planning on throwing away the frame when its first Shimano pressfit BB wears out? If not then it can surely be changed.

[Attermann]

No carbon crankset for your bottom bracket: BB86 can be only used with 24mm spindle which afaik means only Shimano or Rotor (both aluminium). Shimano FC-R9100 is, in terms of weight, the best you can get with 24mm spindle.

none of that is remotely true, off course you can use a 30 mm axle in bb86, there is 4130 bearings, and it works great, and there is srm origin that you can buy in 24 mm, and that's made of carbon.