Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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Is you lever an STI shift/brake lever, or is it just a brake lever?
I've never heard of RXT shifters, is this a road or mountain bike?
STI dual-control levers (RSX, RX100, etc.) have the band-clamp, 5mm Allen bolt under the rubber hood, following the visible channel on top (and to the outside of) the lever body.
Road brake levers typically use a 4 or 5mm allen key fitted through the opening at the front of the brake lever, from the front. There may be a hole in the lever, or you may have to apply the brake lever to create the opening at the front for the Allen key.
Mountain bike levers use similar sorts of internal and external clamping bolts, which usually take a 4 or 5mm Allen key.