A rear blinky light unless your only riding on mups
a front headlight if you ride at night
a seat bag for on the road repairs
pump unless you preffer co2
a second water bottle unless your rides are < an hour.
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2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
2000 litespeed Unicoi Ti, XTR,XT, Campy crank, time atac, carbon forks