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How hard is it to replace 140mm rotors with 160mm?

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How hard is it to replace 140mm rotors with 160mm?

Old 06-01-17, 01:48 AM
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How hard is it to replace 140mm rotors with 160mm?

My Giant TCX came with stock 140mm rotors and SRAM Rival disk brakes.

Is it possible / desirable to replace these with 160mm rotors, and what would be involved? The Giant is a CX bike, but I plan to use it for road and gravel riding.

I presume that I would need to replace the adapter that goes between the frame and the calliper to offset the calliper to fit the larger rotor. Are these adapters standard for all frames and brake manufacturers, are are they vendor specific (e.g. SRAM)?

Thanks for any advice!

John
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Old 06-01-17, 02:01 AM
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i wouldn't attempt it. getting adapters that work as expected is black magic. i've been there and have a couple of 160mm rotors sitting on the shelf, unused, to prove it. you're thoughts WRT getting an adaptor is for the most part correct. but, really, i found i could readily lock up a 140mm rotor with ease, on the road. actually, too easily. YMMV though.
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Old 06-01-17, 03:16 AM
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On MTBs, it's a marginal issue.


Post Mount, the (MTB) standard is 160 front, (and I believe rear too) so for that rotor size(never seen anyone go smaller) you simply bolt the caliper straight to the frame/fork, adjust sideways and you're done.


IS mount, you pretty much always have to use an adapter anyhow, so you simply shop accordingly. IS to PM adapter sizing differs when used front rear, so pay attention.


PM-to-PM for MTBs are easy. Fit bigger rotor(s). Buy adapter, remove caliper, bolt adapter to frame/fork, bolt caliper to adapter, insert wheel, adjust caliper sideways. done.


Can't find pics good enough to tell what might be on your bike, whether it's flat mount or regular calipers etc.


Assuming you have regular - not flat mount calipers:


Since you have adapters, and 140 mm rotors, there's a chance that they've used the 160 mm standard PM and stepped down using adapters.


Me, I'd start with removing the adapters, do a test mount. Ought to tell you well enough if the caliper sits high enough to take a 160 mm rotor.


If not, you'd have to research what adapter to use.


I've mixed adapters and calipers with happy abandon w/o issues.


When I rework disc brakes, I generally use bigger rotors front than rear. Functionally, it's not required, but IMO it gives a more balanced and nicer feel to the brakes.
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Old 06-01-17, 06:22 AM
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Assuming that the bike supports 160mm rotors then all you need are the proper adapters and the larger rotors.

Getting the right adapters is not difficult. Post closeup pictures of your bakes and maybe we can help. It would be helpful to know the year and exact model.

Larger rotors will absorb and dissipate more heat if you are doing long descents.


-Tim-
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Old 06-01-17, 07:17 AM
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Thanks for the replies. I should have added that the disk brake calipers are flat mounted SRAM Rival on a 700c wheel.

It sounds like it might be more effort than it's worth to try to go 160mm rotors. I don't have any problem braking on the road, but I had read that 160mm front rotors are advisable for gravel riding, hence my interest.

John.
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Old 06-01-17, 08:18 AM
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It sounds like it might be more effort than it's worth to try to go 160mm rotors.
It doesn't take much effort to put adapters on.

Without seeing the setup, you might only need a rear 160mm adapter as a front 140mm adapter flips around for a 160mm rotor.

https://www.competitivecyclist.com/s...aliper-bracket
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Old 06-01-17, 11:30 AM
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Originally Posted by cobba
Without seeing the setup, you might only need a rear 160mm adapter as a front 140mm adapter flips around for a 160mm rotor.
Yes, the front adapter already on the bike is likely reversible.

Mine is able to be flipped around and used for both 140 and 160. It says "Up for 160" on one side and "Up for 140" on the other.

Based on the link provided by [MENTION=65684]cobba[/MENTION], it looks like SRAM is the same.




-Tim-
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Old 06-01-17, 11:37 AM
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ISO to post mount adapters are marked with 2 sizes, so front 160 uses a 160/140, rear 160 you need a 180/160 adapter.

[I have a R'off, 4 bolt 160 rear, and a regular 160 front, on my bike quite unlike yours , but that is the general mechanics ]
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