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Gear Ratios For Turbo Trainer

by ibr17xvii
Thu, Aug 02, 2018 08:31
7

I want to put a bike on my turbo but the gear ratios don't match - I have a 11/28 cassette on the turbo but 11/32 on the bike.

Aside from removing the cassette on the turbo & replacing it with a 32 what's the easiest way round it?

I was thinking of taking the chain off & putting a shorter one on specifically for the turbo but wasn't sure if that would work & if the rear derailleur would need adjusting or be compatible with the smaller cassette.

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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7 comments

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CXR94Di2 | 6 years ago
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better still, Zwift, bigringVr, have a difficulty setting. All this does move your gearing, so you can use for example 53/39 with a 11-28 and still be able to cycle up Alp d' Zwift. Zwift works out the speed and resistance from your power meter. You down have a power meter/Decent smart trainer?

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ibr17xvii replied to CXR94Di2 | 6 years ago
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CXR94Di2 wrote:

better still, Zwift, bigringVr, have a difficulty setting. All this does move your gearing, so you can use for example 53/39 with a 11-28 and still be able to cycle up Alp d' Zwift. Zwift works out the speed and resistance from your power meter. You down have a power meter/Decent smart trainer?

Yeah I have a Wahoo Kickr that I use all the time with Zwift but not considered that.

So basically instead of physically changing gear on the bike adjust the difficulty setting on Zwift?

Avatar
Canyon48 | 6 years ago
2 likes

You don't have to worry about the cassette not having the same range.

An 11-28 cassette will work absolutely fine with a bike that is set up for 11-32. Nothing needs adjusting at all, it will all be fully compatible (assuming it is all the same speed).

There is only a problem if you do the opposite and try to fit an 11-32 cassette on a bike that is set up for 11-28. However, in your case, everything should be compatible and the chain will not need changing.

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ibr17xvii replied to Canyon48 | 6 years ago
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Canyon48 wrote:

You don't have to worry about the cassette not having the same range.

An 11-28 cassette will work absolutely fine with a bike that is set up for 11-32. Nothing needs adjusting at all, it will all be fully compatible (assuming it is all the same speed).

There is only a problem if you do the opposite and try to fit an 11-32 cassette on a bike that is set up for 11-28. However, in your case, everything should be compatible and the chain will not need changing.

Really?!?!?! All sounds far too simple........

I just presumed it would be a right faff with the different ratio.

They are both 11 speed so maybe just a little tweak of the barrel adjuster & should be good to go?

Avatar
Canyon48 replied to ibr17xvii | 6 years ago
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ibr17xvii wrote:

Canyon48 wrote:

You don't have to worry about the cassette not having the same range.

An 11-28 cassette will work absolutely fine with a bike that is set up for 11-32. Nothing needs adjusting at all, it will all be fully compatible (assuming it is all the same speed).

There is only a problem if you do the opposite and try to fit an 11-32 cassette on a bike that is set up for 11-28. However, in your case, everything should be compatible and the chain will not need changing.

Really?!?!?! All sounds far too simple........

I just presumed it would be a right faff with the different ratio.

They are both 11 speed so maybe just a little tweak of the barrel adjuster & should be good to go?

It really is that easy 1

You shouldn't even need to adjust anything at all, not even the barrel adjuster.

My Whyte Wessex has 11 speed 11-32, I can run it with a different wheelset which has an 11-28 cassette if I want, without a single issue.

Avatar
ibr17xvii replied to Canyon48 | 6 years ago
0 likes

Canyon48 wrote:

ibr17xvii wrote:

Canyon48 wrote:

You don't have to worry about the cassette not having the same range.

An 11-28 cassette will work absolutely fine with a bike that is set up for 11-32. Nothing needs adjusting at all, it will all be fully compatible (assuming it is all the same speed).

There is only a problem if you do the opposite and try to fit an 11-32 cassette on a bike that is set up for 11-28. However, in your case, everything should be compatible and the chain will not need changing.

Really?!?!?! All sounds far too simple........

I just presumed it would be a right faff with the different ratio.

They are both 11 speed so maybe just a little tweak of the barrel adjuster & should be good to go?

It really is that easy 1

You shouldn't even need to adjust anything at all, not even the barrel adjuster.

My Whyte Wessex has 11 speed 11-32, I can run it with a different wheelset which has an 11-28 cassette if I want, without a single issue.

Sounds good, hopefully it really is that easy!

Thanks for your help mate. 

Avatar
Canyon48 replied to ibr17xvii | 6 years ago
0 likes

ibr17xvii wrote:

Canyon48 wrote:

ibr17xvii wrote:

Canyon48 wrote:

You don't have to worry about the cassette not having the same range.

An 11-28 cassette will work absolutely fine with a bike that is set up for 11-32. Nothing needs adjusting at all, it will all be fully compatible (assuming it is all the same speed).

There is only a problem if you do the opposite and try to fit an 11-32 cassette on a bike that is set up for 11-28. However, in your case, everything should be compatible and the chain will not need changing.

Really?!?!?! All sounds far too simple........

I just presumed it would be a right faff with the different ratio.

They are both 11 speed so maybe just a little tweak of the barrel adjuster & should be good to go?

It really is that easy 1

You shouldn't even need to adjust anything at all, not even the barrel adjuster.

My Whyte Wessex has 11 speed 11-32, I can run it with a different wheelset which has an 11-28 cassette if I want, without a single issue.

Sounds good, hopefully it really is that easy!

Thanks for your help mate. 

No problem 1

The 11 speed components are much more reliable in my experience and don't seem to be so susceptible issues when changing cassettes/gears.

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