Trainer and bike settings
07-22-25 | 07:34 AM
#1
Thread Starter
Senior Member
Joined: Mar 2016
Posts: 1,094
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From: South Italy
Bikes: BMC SLR01; Cannondale Trail; Custom steel gravel.... plus 5 vintage
Trainer and bike settings
Hello. I have an ultegra di2 12v.
On my treainer i have installed my old 11-34. On my bike i'm using the 11-30.
***chain length is correct for both****
i want to know how i can set it up correctly for both because on the trainer the derailleur is skipping a bit.
On my treainer i have installed my old 11-34. On my bike i'm using the 11-30.
***chain length is correct for both****
i want to know how i can set it up correctly for both because on the trainer the derailleur is skipping a bit.
07-22-25 | 07:45 AM
#2
aka: Dr. Cannondale
Joined: Jul 2009
Posts: 8,683
Likes: 6,390
It is likely that you will have to make minor adjustments to your RD. You're dealing with two different cassettes and different hubs, they are seldom exactly alike.
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07-22-25 | 08:45 AM
#3
Facts just confuse people
Joined: Jul 2017
Posts: 19,375
Likes: 7,082
From: Mississippi
Bikes: Tarmac Disc Comp Di2 - 2020
Trainer is a wheel on trainer or wheel off trainer?
If it's a wheel on trainer, then the bike did shift correctly before you put it on the trainer... or when you take it off?
But I really assume that it is a wheel off trainer. And rccardr gave about the only answer that one can give for the virtually no information you gave us.
If it's a wheel on trainer, then the bike did shift correctly before you put it on the trainer... or when you take it off?
But I really assume that it is a wheel off trainer. And rccardr gave about the only answer that one can give for the virtually no information you gave us.
07-22-25 | 09:35 AM
#4
“We don’t need no badges”
Joined: Sep 2019
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From: SF Bay Area
Bikes: 1981 Holdsworth Special, 1993 C-dale MT3000 & 1996 F700CAD3, 2018 & 2019 Cervelo R3’s & 2022 R5, JustGo Runt, Ridley Oval, Kickr Bike 8-)
A wheel off trainer, can have both wheel cassette and trainer cassette be adjusted, so as to use the same rear derailleur setting.
But nobody said it was easy.
https://zwiftinsider.com/trainer-cassette-spacing/
Barry
But nobody said it was easy.
https://zwiftinsider.com/trainer-cassette-spacing/
Barry
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07-22-25 | 10:59 AM
#5
Senior Member
Joined: Aug 2007
Posts: 2,655
Likes: 421
You installed your old cassette on the trainer and its skipping suggests to me cassette is worn. Put the cassette that is on your bike right now and switch it to the trainer and see if it skips. If it doesn't you will know the answer. I also don't think your derailleur is skipping but the chain gliding over the top of the cogs unless I am confused as what you are saying. I use four different bikes on my Tacx trainer (all 12 speed) and I never need to adjust for anything.
