Mixing Shimano A type & B type chainrings
I'm finding after over a decade with the same bike running the same parts a few group/era specific points have faded from memory.
Bike is running a full Ultegra 6700 group with severely worn out 39/53 rings. Today I came across a deal too good to miss on a DA 7900 54t. FD works just fine with matched B type 34/50 compact crank(16t spread). The question is will finesse and possibly some mechanical jiggery pokery allow one to continue spirited riding with the mismatch. Or should I forget I ever considered it and hunt down a 42t. After 4 notices parts were backordered and a few outright refunds due to non-existent stock in the last week. I'm solid on the fact there is a new 6700 39t inner ring in my parts bin. Procuring the matching A type 42t is actively being considered a crapshoot since I can't trust online stock trackers. http://www.thetallcyclist.com/wp-con...gs-636x310.png |
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I'm running R9100 50/36 Which should be 50/34 and the 36 is fine. FWIW
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Well, like Pete said, ultimately they are all gonna shift. But, if you want the quickest best shifting rings out there I'd look at Wickwerks. I've ran 3 different setups of his stuff and they work so well.
https://wickwerks.com/product-category/chainrings/ First was an odd 53/34 setup he wanted me to test. On the upshifts I swear you just start to push the shift lever over and the jump is already made. Than I've got a more standard setup and it's the same way. Finally he cobbled together a triple setup for me that he said wasn't optimum but it works perfectly out on the road. His rings are on a ton of CX bikes in Europe. Now that said....you do have to get past the looks sometimes.... https://pbase.com/jhuddle/image/163817821.jpg If I remember correctly the two inner rings are mountain ones while the outer is for road. https://pbase.com/jhuddle/image/169055613.jpg |
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:confused::confused: I thought this was an english speaking forum. ;) |
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Thanks for doing your part buying and advertising new stuff to keep all of these companies afloat. |
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BUT, back to the original question..you can worry about computer generated studies about shifting techniques..or just buy the 'miss matched' CRs and go ride. :) |
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