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Spindle Interface Type: Square Taper JIS
1-3/8" Lower Bearing: 49mm OD x 37mm ID x 7mm Thick (45x45 degree)
4mm machined Allen Key slot for easy installation and removal
A small knob located between the center tread and side knobs provides a smooth transition while cornering
Uses high quality sealed bearings
OR8 SEATPOST CLAMP CLAMPDOWN QR 34.9 BK Racks Spindle Interface Type: Square TaperAL6061 T6 alloy quick release seatpost clamp Stainless steel bushing ensures smooth lever action Adjustment knob allows for on the fly fine tuning Rounded edges and floating bolt ovalized hole design protects carbon frames and seatposts 28. 6mm for 25. 4mm seatpost and steel frame 29. 8mm for 27. 2mm seatpost and chromoly frame 31. 8mm for 27. 2mm seatpost and aluminum frame 34. 9mm for 30. 9mm seatpost and aluminum frame, or 31. 6mm seatpost and
