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I'm wondering if anyone had any experience of switching chainsets over with the latest iteration of Ultegra and whether or not a front mech adjustment will be necessary. The bike currently has 52-36 but I'm doing a ride where I want lower gearing, so might swap chainrings. I'm aready running the biggest cassette possible with the rear mech. 

 

Reason being, my weight to power ratio is better than power to weight right now!

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maviczap [354 posts] 1 month ago
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You'll find you'll need to drop the mech to keep the shifts crisp.

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Jimthebikeguy.com [260 posts] 1 month ago
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Nothing to it, but you will need to lower the front mech down the frame a short way, and also then readjust it to be thorough.

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kil0ran [1510 posts] 1 month ago
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maviczap wrote:

You'll find you'll need to drop the mech to keep the shifts crisp.

Easy enough to do, unless it's a braze-on and it's already as low as it can go. Unlikely, but some race bikes won't take a compact (Kinesis Aithein springs to mind)

Won't need much of a drop but you'll probably need to detach the cable and re-tension. You might be lucky and not have to do that as the new Ultegra front-mech has a tension adjuster built in, and you may still have a barrel adjuster inline near the shifter too. Oh and you may have to move the tiny stick-on backup plate too. 

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BehindTheBikesheds [3236 posts] 1 month ago
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you could lower the mech but frankly you won't notice any difference if you don't.

When you say you're running gthe biggest cassette for your rear mech, is that the biggest according to the manufacturer or actual real worl dbiggest?

i.e. the Dura Ace/6800 short cage rear mechs will handle a 32T yet were designated to only handling a 28T

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Bowks [52 posts] 1 month ago
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BehindTheBikesheds wrote:

you could lower the mech but frankly you won't notice any difference if you don't.

When you say you're running gthe biggest cassette for your rear mech, is that the biggest according to the manufacturer or actual real worl dbiggest?

i.e. the Dura Ace/6800 short cage rear mechs will handle a 32T yet were designated to only handling a 28T

 

It's an R8000 short cage mech running with an 11-30t cassette.