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Converting to compact crankset; mixing 9 and 11 speed

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Converting to compact crankset; mixing 9 and 11 speed

Old 05-02-21, 12:15 PM
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pennpaul
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Converting to compact crankset; mixing 9 and 11 speed

I wanted to modify my 2003 Fuji road bike (53/39, 12-23) for my current style of riding--slow with more lower gears. I was going to swap in a spare gravel bike crankset and get a larger rear cog, but then remembered my Fuji is a 9-speed.

The price of components is crazy so I'll find an 11-28 9-speed cassette in the back (max for my Ultegra RD-6500 SS), but then realized my spare crankset might not work since it's coming from an 11-speed bike, or will it?

I measured the distance of the outside faces of the two chainrings and the one from the 11-speed is about 9.5mm whereas the rings on my Fuji are 10.5 to 11mm apart. Will my current Ultegra STI front shifter work on this 11-speed crankset simply by adjusting the high/low screw on the front derailleur? Would I need a narrower chain, too?

Thanks,
Paul
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Old 05-02-21, 07:00 PM
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ft3safety
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Your 11s crankset should work with an 11s chain. You can also use a Shimano mountain bike rear derailleur 9s with a 12-36 cassette.
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Old 05-03-21, 09:23 AM
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9 speeds rule...

11-36 cassette with a new GS or SGS derailleur. A Sora GS and 11-36 cassette transformed my 9 speed road bike into a good hill climber, and it shifts beautifully. An Alivio RD would also work well, I believe.
You could keep the chainrings as they are; 39F - 36R is a decent hill climbing combo.
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Old 05-03-21, 10:04 PM
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pennpaul
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Originally Posted by Chuckles1 View Post
11-36 cassette with a new GS or SGS derailleur. A Sora GS and 11-36 cassette transformed my 9 speed road bike into a good hill climber, and it shifts beautifully. An Alivio RD would also work well, I believe.
You could keep the chainrings as they are; 39F - 36R is a decent hill climbing combo.
Thanks! Piecing this combination together on eBay was easier (and cheaper) than what I originally planned. I'll find out in 2 weeks, I guess.
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