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Discussion Starter · #1 ·
Hi,

I am contemplating getting a small-frame 24" wheel Kona MTB for my 8 year old son. We live where dirt riding always implies hills, and he can't really pedal uphill on his single speed BMX bike.

So I found this used Kona, but I learned (from the BMX bike) that his hands weren't quite up to the task of using cable V-brakes on extreme downhills. So I installed a set of Magura hydraulic rim brakes, and he was able to do steep downhills with me.

Do those junky Hayes MX4 brakes use a 'standard' mount for the caliper? What about the rotors? Will I run into incompatibilities if he needs to switch to hydraulic disc brakes? Which brands have compatible mounts? This bike is probably 4 years old, if that helps.

Lifespeed
 

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Discussion Starter · #2 ·
What about the Hayes HFX-9 entry-level hydro? Will it fit? Seems reasonably-priced for a kid's first MTB . . .

Lifespeed
 
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