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Unlike the dirt tracker, it came with brakes: a rear disc brake, and in front, a Fontana four leading shoe drum brake, [9] which is two twin leading drum brakes paired side by side in two drums. [12] The XRTT is the final example of a competition motorcycle with drum brakes, superseded by disc brakes on all other racing bikes due to the ...
In polymers, selective etching is due to polymer fragmentation in the ion track core. The core zone is surrounded by a track halo in which cross-linking can impede track etching. After removal of the cross-linked track halo, the track radius grows linear in time. The result of selective etching is a trough, pore, or channel.