MTB rotors 160mm on the back WT?!

dudleygb
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MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 12:51 am

So I am putting new discs on and I went and ordered 2 180mm rotors and I see my rear wheel was a 160mm!!!!!!!!!
Ultimate NOOB mistake!!!!!!!!!!!! ARGHHHHHHHH

So, I just wanna ask,,,,,is it ok to have 2 180mm rotors? If so then I can just get an adaptor. If not I need to buy a 160mm rotor!!! :(((
I'm SO stupid!!! Anyways, this was my first try.
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mitzikatzi
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Re: MTB rotors 160mm on the back WT?!

Postby mitzikatzi » Tue Jul 15, 2014 2:15 am

Yes you can use an adapter and a 180mm rotor on the rear. It is just "overkill" in most cases.

dudleygb
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Re: MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 3:29 am

mitzikatzi wrote:Yes you can use an adapter and a 180mm rotor on the rear. It is just "overkill" in most cases.


thx mitz
some say the rear will lock up with a 180 on the back?
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dudleygb
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Re: MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 3:54 am

mitzikatzi wrote:Yes you can use an adapter and a 180mm rotor on the rear. It is just "overkill" in most cases.


is this the one?
http://www.pushys.com.au/shimano-sm-ma9 ... aptor.html
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Re: MTB rotors 160mm on the back WT?!

Postby bychosis » Tue Jul 15, 2014 3:56 am

Will lock up with 160mm too, just depends how hard you pull the lever! My first disc brakes were 2nd hand and 203f, 185r on an XC bike. Worked fine, but just overkill so I eventually scaled down one size for each, still work fine.
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Re: MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 4:01 am

bychosis wrote:Will lock up with 160mm too, just depends how hard you pull the lever! My first disc brakes were 2nd hand and 203f, 185r on an XC bike. Worked fine, but just overkill so I eventually scaled down one size for each, still work fine.



awesome thx bychosis, can u confirm that adapter is correct one?
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bychosis
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Re: MTB rotors 160mm on the back WT?!

Postby bychosis » Tue Jul 15, 2014 4:04 am

Certainly looks to be correct adaptor.
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Re: MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 4:09 am

bychosis wrote:Certainly looks to be correct adaptor.


thx mate i will change back to 160 later again
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Re: MTB rotors 160mm on the back WT?!

Postby m@ » Tue Jul 15, 2014 6:51 am

I think I still have a brand new 160mm XT icetec rotor sitting around somewhere, if you'd rather cut to the chase...

As an aside, when I upgraded the brakes on my Anthem to XT, I went for 160mm front and rear on the LBS's recommendation.
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Re: MTB rotors 160mm on the back WT?!

Postby barefoot » Tue Jul 15, 2014 10:12 am

dudleygb wrote:
mitzikatzi wrote:Yes you can use an adapter and a 180mm rotor on the rear. It is just "overkill" in most cases.


thx mitz
some say the rear will lock up with a 180 on the back?


If you squeeze the lever too hard, you'll lock it up.

If you don't squeeze the lever too hard, you won't.

People run 203mm rotors at both ends of bikes. 180mm is not going to cause an international crisis.

A new bracket will space your caliper out as required.

tim

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Re: MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 10:45 am

barefoot wrote:
dudleygb wrote:
mitzikatzi wrote:Yes you can use an adapter and a 180mm rotor on the rear. It is just "overkill" in most cases.


thx mitz
some say the rear will lock up with a 180 on the back?


If you squeeze the lever too hard, you'll lock it up.

If you don't squeeze the lever too hard, you won't.

People run 203mm rotors at both ends of bikes. 180mm is not going to cause an international crisis.

A new bracket will space your caliper out as required.

tim



:) excellent thank you!
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dudleygb
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Re: MTB rotors 160mm on the back WT?!

Postby dudleygb » Tue Jul 15, 2014 10:46 am

m@ wrote:I think I still have a brand new 160mm XT icetec rotor sitting around somewhere, if you'd rather cut to the chase...

As an aside, when I upgraded the brakes on my Anthem to XT, I went for 160mm front and rear on the LBS's recommendation.


oooh nice, how much you want for it? PM me please
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Re: MTB rotors 160mm on the back WT?!

Postby SmellyTofu » Fri Jul 18, 2014 10:11 pm

I couldn't lock up on the 160mm disc with the Shimano M445 hydraulic brakes. Ended up getting cheap Shimano SLX 203mm rotors for <$30 each and some adaptors. Instant satisfaction that I repeated the same exercise on the commuter with Tektro Nouvela. Doing this F&R upgrade to 203mm worked out to be way cheaper than buying fancy 1 x XT brakes.

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Re: MTB rotors 160mm on the back WT?!

Postby jacks1071 » Sun Jul 20, 2014 12:06 am

SmellyTofu wrote:I couldn't lock up on the 160mm disc with the Shimano M445 hydraulic brakes. Ended up getting cheap Shimano SLX 203mm rotors for <$30 each and some adaptors. Instant satisfaction that I repeated the same exercise on the commuter with Tektro Nouvela. Doing this F&R upgrade to 203mm worked out to be way cheaper than buying fancy 1 x XT brakes.


You could probably have achieved similar results without the weight by changing to some better brake pads, I'm sure it looks pretty cool though :-)
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Re: MTB rotors 160mm on the back WT?!

Postby human909 » Sun Jul 20, 2014 10:41 am

SmellyTofu wrote:I couldn't lock up on the 160mm disc with the Shimano M445 hydraulic brakes. Ended up getting cheap Shimano SLX 203mm rotors for <$30 each and some adaptors. Instant satisfaction that I repeated the same exercise on the commuter with Tektro Nouvela. Doing this F&R upgrade to 203mm worked out to be way cheaper than buying fancy 1 x XT brakes.


Caliper brakes and V-brakes can easily lock up a wheel. If you can't lock a wheel up with a 160mm disc then something is clearly wrong.

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