It's my brothers birthday and his seatpost is FUBAR. I'm going to get him a new post - Twelfty from On-One - but I'm unsure of the post diameter required. It's a suprise so I can't ask him, his wife has no clue, and I won't see him till next week - anyone know the seatpost diameter for a GT Agressor XC2 2009??
Discuss the eternal "Which fork/bike/tyres should I buy?" questions.
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