What am I missing?

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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tarmackev
Posts: 223
Joined: Sat Jan 15, 2011 9:59 pm

by tarmackev

ImageImage
I've just purchased an old Super X frame, I'm trying to fit my Ultegra disc brakes.
I was running 160 front 140 rear.
I've got a 140 on the front and it's all good but I would prefer a 160, not sure exactly which adapter I need?
Also the rear 140, I'm struggling to find exactly the adapter I need?

Any help really is much appreciated, you know how it is when your build is nearly complete apart from one trivial thing.


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motorapido
Posts: 261
Joined: Fri Jul 30, 2010 7:08 pm

by motorapido

I wouldn't have thought you would need an adaptor for the rear, as 140 is the smallest standard disc size. It looks from the wear mark on the rear disc that you have not had the full width of the pad contacting the disc. If you tighten the calliper bolts down can you still spin the disc. If not some shim washers might be needed to give the calliper to disc clearance.

For the front use the Shimano +10 adaptor and some 10mm longer bolts, or you could any other spacer designed for a larger disc, my personal favourites for a 20mm larger disc are the PM - PM Ashima AU31 adaptor, nice and light and come with Ti bolts.

http://www.ashima.com.tw/products_detail.php?Key=23
Last edited by motorapido on Mon Jul 31, 2017 10:31 pm, edited 1 time in total.

tarmackev
Posts: 223
Joined: Sat Jan 15, 2011 9:59 pm

by tarmackev

That's great, thank you.


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ms6073
Posts: 2406
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

Late to the party, but I was under the impression that the Super X post mount frames were for 160mm brake rotors and that while an adapter could be used for larger, aside having the post mounts machined for smaller rotors, there was no way to use 140mm disc rotors with those frames.
Last edited by ms6073 on Tue Aug 01, 2017 3:46 am, edited 1 time in total.
Michael - The Anaerobic Threshold is neither...

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cerro
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Location: Stockholm, Sweden
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by cerro

There is no adapter to use smaller rotors. If the frame is made for 160mm like it looks like yours is and as ms6073 writes then you have to use 160mm or bigger.
/jonas l
http://cerrol.wordpress.com (my cyclingblog)

tarmackev
Posts: 223
Joined: Sat Jan 15, 2011 9:59 pm

by tarmackev

Hmmm, I have 140 front and 140 rear and it's working perfectly


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CallumRD1
Posts: 107
Joined: Mon Apr 03, 2017 2:54 pm

by CallumRD1

It's not working perfectly at all. Look at the wear marks on the rotors. You're only using the outer portion of the rotor. I would wager that if you looked at your pads after a few hundred miles you'll see that you're only wearing the bottom portion of them. You should be running 160mm rotors which will result in you using the full surface of the pad. Running 140mm rotors as you have those set up is not safe.

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ms6073
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Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

To hitch hike on the previous reply,m this is what you are missing -
proper rotor/pad interface:

Image
Michael - The Anaerobic Threshold is neither...

tarmackev
Posts: 223
Joined: Sat Jan 15, 2011 9:59 pm

by tarmackev

Thanks for the help guys, I'll get 160's on.
Many thanks


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tarmackev
Posts: 223
Joined: Sat Jan 15, 2011 9:59 pm

by tarmackev

ImageImage
The 160 rotor doesn't fit in so this has to be right.....

CallumRD1
Posts: 107
Joined: Mon Apr 03, 2017 2:54 pm

by CallumRD1

It definitely isn't right. Send an email with those photos to Cannondale and see what they have to say.

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ms6073
Posts: 2406
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

Would appear the post mounts are half-way between correct height for 160mm. I am guessing the original owner took the bike to a shop where the mechanic got a little over zealous facing the post mounts with a facing tool like the Park DT-4.
Michael - The Anaerobic Threshold is neither...

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