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A New Crank Arm Power Meter with an Old Crank Set?

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A New Crank Arm Power Meter with an Old Crank Set?

Old 05-09-21, 09:51 AM
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Lewis Yelin
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A New Crank Arm Power Meter with an Old Crank Set?

Hey all, I'd be grateful for guidance about adding a new crankarm power meter to an old crankset. Here are the details:

I've got a Shimano Ultegra FC-6500 crankset (on a 2003 Fuji Roubaix Pro, in case it matters). I'm leaning towards replacing the left crankarm with the Stages Gen3 power meter that is built into a Shimano 105 R7000 crankarm. My thinking is that any new crank arm is going to be different from the rest of the late 1990s FC-6500 crankset, and given Shimano's trickle down, the 105 is already likely to be an improvement over the old FC-6500, and it's $50 less than the Stages Ultegra R8000. Is there a flaw to this logic?

Will there be any compatibility issues mixing a new Shimano crank arm with an old crankset? The Stages product information page says: "This Shimano 105 R7000 Stages Power meter is compatible with all Shimano Hollowtech II road drivetrains."

Many thanks for your advice!
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Old 05-09-21, 09:53 AM
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alcjphil
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Ultegra 6500 cranks use Octalink bottom brackets. HT II cranks are 2 piece and will not fit that bottom bracket
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Old 05-09-21, 10:01 AM
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Ah, asked and answered. Looks like I'll have to look for another type of power meter (or commit to a complete crankset/BB upgrade). Thanks very much for your help!
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Old 05-09-21, 11:29 AM
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If you have time and don't have to ride your bike or you have another crank you can use, you can send the arm or entire crank in to have some brands installed on the crank or crank arms. 4iiii is one of them.
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Old 05-09-21, 11:41 AM
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Originally Posted by Iride01 View Post
If you have time and don't have to ride your bike or you have another crank you can use, you can send the arm or entire crank in to have some brands installed on the crank or crank arms. 4iiii is one of them.
Thanks for the heads up! I think I may look for a used power meter that will fit on an octalink BB or a 16h hub meter that I can put on my back wheel. I'm not finding much so far, though.
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Old 05-09-21, 02:39 PM
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Hub based power meters will probably be like 27" wheels of vintage bikes. You can still find them, but the selection will be less and less and there won't be any new innovative stuff made for them.

Definitely IMO though. My track record on predictions only holds up well when you don't consider the times I was wrong. <grin>
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