I have Xero XSR-3 on my Giant OCR C3, no complaints look great and no problems KOW, I purchased the bike I was about 285lbs, never had any problems even at that weight. I would recomend
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2005 Giant OCR Composite3
2005 Trek 3700
2006 Flyte SRS-3 FINISHED!!!!!!!!!!!!!!!
2008 Gary Fisher X-Caliber 29er
.........that's how I Roll.