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New Shimano crank arm compatibility with 105 5700

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New Shimano crank arm compatibility with 105 5700

Old 12-02-19, 06:39 PM
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New Shimano crank arm compatibility with 105 5700

Looking into power meters, in particular the 4iiii left only options. I notice on their website they have the newer 105 R7000 discounted a bit. I have 105 5700 on my bike. Will the arm be compatible? How would I know, in general, whether a newer component would be compatible with my bike's equipment?
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Old 12-02-19, 08:21 PM
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By discovering the arm's interface with the axle, the arm's shape (straight or some "s" curve) and the arm's length (and pedal threading but most all are the common 9/16"x20TPI). Andy
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Old 12-03-19, 08:40 AM
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Are you looking to replace just the left arm on your current crank or replace the entire crank? Your FC-5700 is a 10-speed crank and the FC-R7000 is 11-speed but that shouldn't matter if you change the entire crank and it uses the same bottom bracket as the 5700. If you just want to substitute the R7000 left arm on your current 5700 crank, illustrations of the FC-R7000 left arm seem to be very similar in shape to the FC-5700 and, of course, uses the same HTII attaching format. So, just the left crank arm of the FC-R7000 should work if you match the arm length to your current 5700 crank.
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Old 12-04-19, 12:20 PM
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Simple answer, yes, all Shimano external BB cranks use the same interface, the power meter is on the left/NDS, so it's just a case of removing the pedal, and crank arm, then installing the 4iiii arm and pedal, you may want to check it's the same/correct length you need, and expect questions as to why from other riders, as it will look weird, but you won't notice this when riding.
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