MinnMan

My current drive train has an FSA-SLK crankset with a BB30 and a 10 speed (7900) RD. The bottom bracket has been a royal pain and needed replacement nearly every year. Talking to the folks at my LBS today, it was suggested that I replace the crankset with something like an Ultegra R8000 that might give me a more durable BB.

But the R8000 was designed for 11 speed, rather than my current 10 speed. If I mix and match, are there likely to be compatibility issues or problems with smooth shifting?

Troul 

Fwiw i went from the flatbar trig shift, a mtb front der & mtb triple that used a square taper to brifters, road front der & road triple that required the oct bb. No issues.

phtomita

A bit off your question, but I was looking today at compatibility of 5800 and R7000 crankset and found out that the new R7000 has the inner ring 0.4 mm inside than the previous 5800.
Similar with Ultegra and Dura Ace. Then I went to check which FD I have bought when I built and found out it is a FD-5801 - that is compatible with R7000 crankset
https://productinfo.shimano.com/#/co...453&acid=C-455

I had for a few miles (like 20), front 105 5800 50-34T and rear cassette Ultegra 10sp (12-30) paired with RD-5800 (11 sp).
Worked without problem .... I didn't adjusted fully because was just trying out a rear wheel build (my first). I didn't have prob shifting.
Basically swapped the rear wheel and adjusted the limit on RD.

jimincalif

MinnMan

Thanks, that's good to hear.

MinnMan

In theory that matrix is just what I need, except that it compares different current groupsets with one another, and doesn't have the legacy info - e.g., I don't see the 7900 group set in there. But thanks for the info.

MinnMan

While we're at it, do people have opinions about the advisability of doing this to improve BB performance? As I said, the FSA with the BB30 has worn out about yearly (admittedly, I put a lot of miles on that bike - 3-4k/year, but bottom brackets should last longer than that! ). The idea is to switch to the shimano/hollowtech technology using a BB30-24 adaptor. How much should that help?

Are there other options I should consider?

Branko D

I have a 10 speed drivetrain and use 11 speed Dura-ace chains. Shifting works perfectly well, and probably better than older 10 speed KMC chains. If there was any problem with 10 and 11 speed stuff meshing together, there'd be a problem.

TimothyH

Any Shimano 11 speed crankset will work with 10 speed rear. You should have zero anxiety about fit and function. It will be fine.


Consider a Praxis conversion bottom bracket.

https://praxiscycles.com/bottom-brackets/conversion-bb/

Or, if you have the funds, an Enduro Torqtite.

-Tim-

aggiegrads

MinnMan

Thanks for the tip. My mechanic showed me a wheelsmfg unit. From a little reading, it seems that maybe there are some advantages to the Praxis - for example, fewer problems with creaking.

jimc101

Wondering how much you going to be paying out on a conversions kit, vs BB30 bearing replacements.

Have you considered what bearing you are currently using? maybe trying a different spec, say Enduro?

TimothyH

Praxis and Enduro Torqtite are similar concepts. They screw together into the bottom bracket shell and will not creak.

Wheels Manufacturing makes a similar product for BB30. There is nothing to press. Like the Praxis Conversion and Enduro Torqtite it simply screws together.

https://wheelsmfg.com/pf30-threaded-...-bb-black.html

This is what the Enduro Torqtite looks like...





-Tim-

MinnMan

Thanks

It looks like the Enduro costs about twice as much as the Praxis or the Wheelsmfg. What does one get for the extra coin?

TimothyH

One gets the peace of mind that comes with knowing there is none finer, and for non Shimano models, the pleasure of needing not one, but two proprietary installation tools.

Gout de Diamants Champagne. Bugatti Veyron. Rapha Pro Series. Shaken, not stirred.




-Tim-

MinnMan

gotcha. Thanks again.