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11 speed crank compatible with a 9 speed drivetrain

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11 speed crank compatible with a 9 speed drivetrain

Old 06-16-20, 06:18 AM
  #1  
huffman
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11 speed crank compatible with a 9 speed drivetrain

Changing out the drivetrain on my 2001 Litespeed Arenberg with an English threaded bottom bracket. It currently has a Shimano 105 SG-X crankset, 24 mm spindle, with 39B-53B chainrings. The cassette is a 9 speed Hyperglide CS-6500 12-27. I'm about maxed out on the cassette to get some lower gearing and from what I've read 39 is a small as I can go on the cranks. I'd like it the be geared a little bit lower but don't need much.

Can I replace the cranks with an FSA Team Hollow Carbon crankset BB30 34-50? The ad says "Available for New Shimano 11 speed system"

Assume I can use a new bottom bracket with a 30mm opening on this bike to accommodate the larger spindle.

The chain and cassette will also be replaced so any help with chain choice would be appreciated.

If I can't find an appropriate Shimano cassette and I use a SRAM 9 speed?
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Old 06-16-20, 09:34 AM
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There are bottom brackets that take a thirty-millimetre spindle, but they are not the cheapest. FSA makes something called "MegaEvo BSA 30 Bottom Bracket". That is, like, 33 euros in Europe. The BB also looks proprietary to FSA, so vendor lock-in. The factor to watch out for is spindle length.
Any nine-, ten- and eleven-speed chains should work on any nine-, ten- or eleven-speed chainrings. Nine-speed cassettes are compatible between Shimano and SRAM, as are ten-speeds.
The spacing between the chainrings up front might come into the equation, but I might be erring on the side of caution.
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Old 06-16-20, 10:39 AM
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Why not get the Shimano FC-R3000? You'd only have to swap crank set and not worry with BB. And in the rare event you ever were riding conditions where you thought the bigger rings might suit you, then it's an easy swap.
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Old 06-16-20, 02:40 PM
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Yep, "only" Sora but probably works better than any FSA crank and w/o a bottom bracket kludge. May also be available in silver?

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Old 06-16-20, 02:56 PM
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Was looking for 105 but looks like Sora may be my only choice. Currently running 172.5 but a quick search I don't see any. May move to a 175, both my mountain bikes have 175 cranks so shouldn't be a big deal. Thanks for the info.
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Old 06-16-20, 03:05 PM
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Why not get a bigger cassette?
How low do you need?
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Old 06-16-20, 03:56 PM
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175 mm long crank arms on some road bikes with more BB shell drop can be an issue. Particularly if you happen to use wide platform pedals or use extenders.

Some of the road bikes I tried recently had 175 cranks and I was hitting the pavement in turns with the pair of platform pedals they put on them. And I actually did the same with a bike that only had 172.5 cranks. Might not be an issue with normal SPD or SPD-SL as they are generally narrower. Or I suppose you can coast in turns. But that's a limitation I don't like.
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Old 06-17-20, 05:01 AM
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Well it looks like Sora R3000 is the only 9 speed crankset available but not available in 172.5 so I gotta go 170 or 175 but not sure which but thinking 175. It’s a 57cm frame and I use Speedplay pedals so hoping it won’t be an issue.

Amazing this bike came with Ultegra then I had to change to 105 cranks, now neither are available. Going to take the bike to an established LBS and see if I can get a 10 speed drivetrain installed. Also starting to look for a new bike. I bought the ti bike as the last road bike I’ll need. Guess not.

After searching crank arm length on the forum it seems going shorter is better than going longer so I'm going to order the 170 and see how it goes.

The Easton sounds good until you see it $200+ for the complete crankset & rings.

I'll post what happens once I get the parts installed & completed a couple rides. Thanks for al the help.

Last edited by huffman; 06-17-20 at 05:51 AM. Reason: Researched crank lengths
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Old 06-17-20, 05:16 AM
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Originally Posted by huffman View Post
Changing out the drivetrain on my 2001 Litespeed Arenberg with an English threaded bottom bracket. It currently has a Shimano 105 SG-X crankset, 24 mm spindle, with 39B-53B chainrings. The cassette is a 9 speed Hyperglide CS-6500 12-27. I'm about maxed out on the cassette to get some lower gearing and from what I've read 39 is a small as I can go on the cranks. I'd like it the be geared a little bit lower but don't need much.

Can I replace the cranks with an FSA Team Hollow Carbon crankset BB30 34-50? The ad says "Available for New Shimano 11 speed system"

Assume I can use a new bottom bracket with a 30mm opening on this bike to accommodate the larger spindle.

The chain and cassette will also be replaced so any help with chain choice would be appreciated.

If I can't find an appropriate Shimano cassette and I use a SRAM 9 speed?
Currently running a GRX 11sp crank with 8sp 600 (friction front) with no issues. GRX does have a wider stance and chain line but I got it for the lower 30/46 gearing while sticking to a 28t cassette.

Easton EC/EA crank will do 30/46 or lower w/ a spider at a road chainline and stance. This is the route I went for my gravel build.

Last edited by DorkDisk; 06-17-20 at 05:23 AM.
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Old 06-17-20, 06:53 AM
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If the bike is a 57, you probably would be more comfortable with 175 than 170. For comparison, I'm 5'9", ride a 55 or 56 and use both 172.5 and 175. I couldn't tell you which was on a bike w/o looking.
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Old 06-17-20, 09:15 AM
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The the only other concern you might think about for deciding crank length is how low do you go on the bars? The more aero your position, the more uncomfortable you might be with longer cranks pushing your thighs further into your gut. If you don't go as low in the drops, then you won't perceive this as even being an issue.

https://cyclingtips.com/2017/09/cran...age-power-fit/

In the other time I tried a crank that was 172 instead of my normal 165 mm cranks, I had a little annoyance behind one of my knees. not quite pain, but I knew it was there for the four months I ran those cranks before replacing them with the 165 mm cranks I'd used most all my life. I'm 5' 11" with 34.5" legs. So that blows the proportional sizing all to heck. Besides, proportional sizing IMO is trying to keep your knee in the position spec'd by KOPs which is another persistent myth of cycling fit. IMO......
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