Originally Posted by
Trek420
"the problem she is having with her handlebar slipping is based on the following compatibility issue. The old school Cinelli stem she is using has a 26.4 mm diameter and the Salsa Poco bars diameter is 26.0mm. Now 0.4 mm may sound like no big deal, yet the stems diameter is too large for the bar and the stem will eventually crack/break. Problem Solver makes a stem shim kit to correct 25.4 to 26.0, this is a 0.6 mm shim, and although close to the necessary shim providing a 0.6 mm difference. The proper and safe action is a new stem :)"
He suggests
"Salsa Poco handlebars with Silvia cork tape
Cinelli XA 80mm stem ...." and goes on to say
"I would probably give the bike shop a B score".