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font of knowledge...... brake help please.

 ton
Posts: 24354
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[#13536585]

fitting a 203mm to my front end and a 180mm to the rear.

i need help to source the correct mounts.

i think the front may be a post to post mount ??

no idea at all what the rear is.     any help greatly apprciated.

 

20260805_111447.jpg 20260805_112707.jpg 


 
Posted : 05/08/2026 12:25 pm
thelawman reacted
Posts: 472
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Front is post mount

Rear is flat mount.

I’ve not seen a 180mm adapter for flat mount though.


 
Posted : 05/08/2026 12:36 pm
Posts: 472
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Here’s one: EDIT designed for front brake, so probably won’t work 

https://www.bikeparts.co.uk/products/aztec-adapter-for-flatmount-calliper-to-flatmount-fork-180mm-front


 
Posted : 05/08/2026 12:39 pm
Posts: 31685
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What size is the current rear disk? You'll need a different adaptor depending on whether it's a 140 or 160 rear FM. Note that you can't use that front FM adaptor above on the rear.


 
Posted : 05/08/2026 12:46 pm
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If you have a 160mm rotor there... this adaptor will allow you to fit 180mm...


 
Posted : 05/08/2026 12:47 pm
 ton
Posts: 24354
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rear disc in 160.   want to change to 180 

 

front is 160. want to go to 203.


 
Posted : 05/08/2026 12:48 pm
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Shimano SM-MA-F203PP for the front.

Shimano SM-MA-R160D/D for the rear.


 
Posted : 05/08/2026 12:52 pm
 ton
Posts: 24354
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ordered.   thanks very much.


 
Posted : 05/08/2026 1:18 pm
kelvin reacted