Hi – I have sets of both of the above. M4s about 5 years old, X2s very new.

How do they match up side by side? In particular are the X2s up to handling long brake-boiling, hot weather, Alpine style descents, or should I stick with the M4s?

Or can I get rid of the M4s now?

(For UK, the X2s are more than man enough, I know that).

Thx.

Put the M4 calipers at on end of a hose and the X2 levers at the other.

Are they Tech or Race?

I have Mono M4 calipers mated to Tech levers, and they work.

Tech X2.

Perhaps a better way of asking the question is “are Tech X2s up to long Alpine descents, can I replace my Mono M4s with them?”.

OK well I see Hope now sell the ‘Tech M4’ which looks pretty much like the ‘old’ M4 Caliper with the new Tech X2 lever.

So I guess the answer is no.