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WhaWhat do I need to know about disc rotor inter-compatibility ?

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WhaWhat do I need to know about disc rotor inter-compatibility ?

Old 06-22-19, 09:20 AM
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What do I need to know about disc rotor inter-compatibility ?

I have a wheelset on the way, (Shimano XT 6-bolt hubs) and I'm thinking about getting a new set of rotors for it, rather than muscling off the set that's currently on the factory wheels (Tektro Aries, no doubt a very low-end brake system) .
This would save me the headache of cleaning up the old bolts, and give me a back-up wheelest that's ready to go, should I ever need it.
Right now, I have a 160mm on the front, and a 140mm on the rear, both standard 6-bolt.
This will basically be a casual, dry-weather, urban/metro type bike, so the braking requirements will not be extreme.
I'm looking at budget rotors on ebay, made by companies like Avid and Tektro, etc., and sold by solid US-based bike-specific vendors. I can pick up the set, w/ bolts, for under $25 delivered.
Can I use pretty much any 6-bolt rotor, that matches my current sizes? Is it all pretty simple and straightforward, or are there any pitfalls I should be concerned about ?
Thanks again........

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Old 06-22-19, 09:24 AM
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diameter numbers.
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Old 06-22-19, 09:28 AM
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Originally Posted by fietsbob
diameter numbers.
I'm not following. Aren't 140/160 mm the diameters ? That's what's on the rotors I have, and two of the common sizes I'm seeing sold. Is there something else i should be looking for?
thanks.....
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Old 06-22-19, 09:45 AM
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That's it .. just get same diameters, or change the adapters to change the diameters.

Have a desire for 180/160 2 of the same ISO tabs to post mount adapters.

160-160 ? need 2 different ones as the adapter is for 1 size longer fitted on the front..

typically labeled as such .. 160/140, 180/160. 210/180...

not so hip to direct mount calipers .. post mount is another spacer set, as disc radius increases
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Old 06-22-19, 09:56 AM
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I have TRP Spyres on my road bike, and two sets of wheels. One has the stock TRP rotors, Maguras on the other. Just match the diameters, and you're good to go. You will need to match the cassette type and spacing too, for the rear.
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Old 06-22-19, 10:14 AM
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Originally Posted by Slightspeed
I have TRP Spyres on my road bike, and two sets of wheels. One has the stock TRP rotors, Maguras on the other. Just match the diameters, and you're good to go. You will need to match the cassette type and spacing too, for the rear.
Thanks for the reply,and good info, but that last part lost me. I wasn't expecting any cassette issues. The coming wheelset hubs are compatible with a range of speeds (8,9,10? Something like that). I have a 9-spd cassette on this bike, and I got a nearly identical wheelset last year (same builder, same everything, but in 26") for another 9spd bike, and I just switched the rotors and cassette, and hit the road. What am I missing?
Thanks again....
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Old 06-22-19, 01:54 PM
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Magura is a bit thicker than Avid discs [Managed to find 4 bolt Avid 160]




...
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Old 06-22-19, 06:59 PM
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Originally Posted by Brocephus
Thanks for the reply,and good info, but that last part lost me. I wasn't expecting any cassette issues. The coming wheelset hubs are compatible with a range of speeds (8,9,10? Something like that). I have a 9-spd cassette on this bike, and I got a nearly identical wheelset last year (same builder, same everything, but in 26") for another 9spd bike, and I just switched the rotors and cassette, and hit the road. What am I missing?
Thanks again....
I just meant same cassette size, number of cogs, etc, and spacer if needed. Looks like you got it covered, if you just swap the same cassette over. I was thinking of a spare wheelset and new cassette. Sorry, I didn't mean to confuse.
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