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Different chainrings

Old 09-16-11, 07:13 PM
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yongkun
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Different chainrings

Is it okay to have chainrings of different make?
Eg. KCNC Blade and maybe a FSA inner chainrings. Will that affect the performance?
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Old 09-16-11, 07:38 PM
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yes. no.
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Old 09-16-11, 07:54 PM
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A couple of factors that could affect performance:

1. Some chainrings (notably Shimano) use offset teeth. Mounting a flat chainring in place of an offset one will result in poor to impossible shifting.
2. Most big rings are designed for a specific size inner ring for best shifting. Shimano used to have A and B designations for their big rings depending on if you were running a 42 or 39T inner/middle ring (for triples).

If you aren't replacing a ring with offset teeth and are not changing tooth counts, you'll probably won't notice any difference in performance.
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Old 09-16-11, 08:23 PM
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There is also no standard for crank spider thickness. So you may find that with a thin spider and thinner rings (or ones with more countersink for the chainring bolts) that the bolts will spin in the crank even when the bolts are fully bottomed out in the nuts.

If that happens you can get spacers (.6mm is the thinnest). But they make assembling the chainrings on the crank a pain.
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Old 09-16-11, 08:28 PM
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yongkun
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Thanks joe. was thinking of changing my FSA super chainrings, outer to KCNC blade while the inner one remains. Doesnt seem like theres Offset teeths from what i observed.
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Old 09-16-11, 09:45 PM
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I had the middle ring of my FSA Gossamer triple crankset replaced a couple weeks ago. After it was done I realised they replaced it with a Shimano 105 middle ring. Works fine, just looks a little odd -grey ring in between 2 black ones. Rode a century last weekend, was not a problem at all.
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Old 09-17-11, 12:03 AM
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Offset teeth you say? What do you mean by this?
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Old 09-17-11, 12:17 AM
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Originally Posted by ilovecycling View Post
Offset teeth you say? What do you mean by this?
This. On the left is a FSA ring. Compare the tooth centreline with the flat surface that contacts the crank spider. The teeth are well to the left (inboard side). On the right is a Shimano small ring. See how the flat surface that contacts the spider is milled out in relation to the teeth centreline, offsetting the teeth further right (outboard and closer to the big ring).

This is why you may not get perfect shifting if you replace a Shimano inner ring with an FSA type or similar. I would suggest that whatever replacement the OP does, he should keep the same tooth offset for best result. However, this only affects shifting - whatever type of ring you use will work perfectly well when not being shifted.




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Old 09-17-11, 12:27 AM
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Thanks for the pic.

It looks to me that the actual top of each tooth is in a similar location on both rings relative to the flat surface that contacts the spider. It just seems that the Shimano ring's teeth have more material to the right of the apex of each tooth.
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