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It depends, remember it's primary aim for me was fast 24hr. I do a LOT more braking in races than your average TTer hitting 10s and 25s. Also, LEJOG, etc where comfort is important. Slevless need all the help using brakes they can get!
Saying that, the Shiv TT has flat ends:
http://chainwheeldrive.com/images/library/Zoom/spec_shiv_tt_sw_module_x2_carb_satin_blk_12_z.jpgWhere can I get them, I wonder?
I thought it was an ergonomic thing: puts the lever in a more usable position.
For all the use they get, it does seem unnecessary and must have an aero hit.
I blame slevless.