MTB rotors 160mm on the back WT?!

Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies

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.
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

by BNA » Tue Jul 15, 2014 2:15 am

BNA
 

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.
Xplora wrote: Do not get cheap SPDs, your body will hurt you.

trailgumby wrote:29ers are awesome.
User avatar
mitzikatzi
 
Posts: 1710
Joined: Mon Jan 21, 2008 10:21 am
Location: Perth

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?
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

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
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

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.
bychosis (bahy-koh-sis): A mental disorder of delusions indicating impaired contact with a reality of no bicycles.
User avatar
bychosis
 
Posts: 2328
Joined: Sat Jan 14, 2012 12:10 pm
Location: Lake Macquarie

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?
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

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

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

Certainly looks to be correct adaptor.
bychosis (bahy-koh-sis): A mental disorder of delusions indicating impaired contact with a reality of no bicycles.
User avatar
bychosis
 
Posts: 2328
Joined: Sat Jan 14, 2012 12:10 pm
Location: Lake Macquarie

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
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

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.
harmonix1234 wrote:Forecast for Hobart next week is rain, sleet, ice and all kinds of hell.
HTFU harmonix.
User avatar
m@
Super Mod
Super Mod
 
Posts: 4459
Joined: Tue Apr 15, 2008 12:20 pm
Location: Northlandia

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
User avatar
barefoot
 
Posts: 998
Joined: Tue Jan 29, 2008 10:05 am
Location: Ballarat

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!
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

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
Polygon COZMIC29 CX3.0
dudleygb
 
Posts: 233
Joined: Thu Dec 12, 2013 10:02 pm

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.
User avatar
SmellyTofu
 
Posts: 613
Joined: Wed Apr 08, 2009 1:01 pm
Location: Obviously not on the bike when I'm online in Sydney

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 :-)
Our Website is: http://www.pro-liteoz.com Find us on Facebook by searching for "Pro-Lite Australia"
User avatar
jacks1071
 
Posts: 2963
Joined: Thu Aug 20, 2009 9:47 pm
Location: Mackay, QLD

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.
human909
 
Posts: 4915
Joined: Tue Dec 01, 2009 10:48 am


Return to The Shed

Who is online

Users browsing this forum: TarmacClimber



Popular Bike Shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Ebay Ebay AU

“Bicycles BNA Twitter
“Bicycles BNA Facebook
“Google+ BNA Google+
“Bicycles BNA Newsletter

> FREE BNA Stickers
> BNA Cycling Kit