Hope rx4 with 9270 levers

Discuss light weight issues concerning road bikes & parts.

Moderator: robbosmans

MichaelB
Posts: 909
Joined: Tue Apr 22, 2008 4:31 am

by MichaelB

I'll disagree that the 2 pot and 4 pot calipers have the same piston area, having measured the piston Dias and calculated them for various options across the board when reviewing my potential setups.

There is quite a variety of piston diameters from diffferent manufacturers, and hence I was surprised that the combo's I tried worked well.

I found the RX4's a bit more fiddle to setup than the Shimano calipers, but nothing that would make me not use them again in the future.

Have found them excellent over the last 3,500km of road riding.

by Weenie


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jlok
Posts: 2028
Joined: Tue Jun 30, 2015 3:30 am

by jlok

One thing the RX4 suffers is that it's too light weight for what it is (monoblock vs 2-piece holding by a pair of steel bolts).

If you press hard enough the RX4 caliper will buldge, just like the older monoblock SRAM Red/Level Ultimate). The brake feel will be mushy at the end of the stroke because the caliper is not stiff enough. The newer 2-piece Level/AXS calipers have a firmer feel at the end of stroke.
Rikulau V9 DB Custom < BMC TM02 < Litespeed T1sl Disc < Giant Propel Advanced SL Disc 1 < Propel Adv < TCR Adv SL Disc < KTM Revelator Sky < CAAD 12 Disc < Domane S Disc < Alize < CAAD 10

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