Disc and mech align...
 

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[Closed] Disc and mech alignment on spare wheelset

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Posts: 35
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Hi, I'm considering building up a spare wheelset - partly because I fancy learning how, but also so I can have one wheelset with fast rolling tyres and one with something more heavy duty.

Question is, if switching between wheelsets like this are the slight differences in disc and cassette position a pain, meaning things need realigning when switching? The hubs won't be the same between wheelsets.

Cheers


 
Posted : 31/10/2020 1:30 pm
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I've done this in the past and it's been fine, but it depends on the relative tolerances / standards adherence of the two hub.

For the discs you can get spacers to fine tune the position which may help.


 
Posted : 31/10/2020 1:36 pm
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Cheers, figured I could shim the discs, but good to see there's a proper product for it.

Guess I'll try it and see. Should be easier than swapping tyres anyway, especially as I like to run inserts.


 
Posted : 31/10/2020 2:00 pm
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You may well need to adjust the top/ bottom limits on the rear mech, but assuming it's the same spec cassette it shouldn't need much more.


 
Posted : 31/10/2020 2:11 pm
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Shouldn't be too much bother if that's the case. After doing it a couple of times I should have it figured out: e.g. 1/2 a turn clockwise on the H screw, 1/4 a turn anti-clockwise on the L, or whatever.


 
Posted : 31/10/2020 2:16 pm
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It depends, sometimes you get lucky and sometimes you dont.

You can shim discs and cassettes out to an extent to make them match the other wheels.


 
Posted : 31/10/2020 2:33 pm
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Done it a bit...probably with 4 wheelsets or so over last few years all different hubs and had one which I needed to reset the calipers to run ok all of a 2minute job per end...also need discipline on chain wear checking assuming not swopping the cassette which I avoid


 
Posted : 31/10/2020 3:25 pm
 igm
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Use the same model hubs if possible.


 
Posted : 31/10/2020 10:01 pm
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I have to centre the calliper and re index every time I swap wheel sets on my gravel bike. That said it only takes 5 mins


 
Posted : 31/10/2020 10:20 pm
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I do this very occasionally, so I would have thought lots of wear differences in transmission each time. I find a bit more noise but nothing more noticeable. The front brakes have been an issue and I have had to realign the calliper to stop serious rub.


 
Posted : 01/11/2020 8:32 am
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I used to do it when I only had one bike.

My mech was fine, but the disc needed shimming. Not by much, but it definitely needed doing.
I got some Syntace shims which are 0.2mm thick and came in a pack of 5 or ten, I think.


 
Posted : 01/11/2020 9:03 am
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As above.. a lot of luck. When I put my heavy duty wheels on the HT I can either lose 1st gear or reindex. Usually I just play with the shifter adjust and lose 1st as the point of the heavy duty wheels means I'll probably push up at least partly.

as above, keep on top of chain wear

The brakes are close enough...but on some other wheels they need a tweak but its all of 1 min.

I've got 5 sets of wheels I use often... non are actually tied to a bike though and its half about what tyres on on what wheels. Some are a but mutually exclusive like my lightest 28H carbon on the 170mm Enduro is a bit pointless or my heavy duty EX511's with insert and DH casing sticky on the XC HT...


 
Posted : 01/11/2020 10:17 am
 Tim
Posts: 1091
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You can shim the discs easily (I didn't need to)

I've never found I've needed to worry about cassette - but a small tweak on barrel adjuster should do it if needed


 
Posted : 02/11/2020 9:55 am

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