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Derby Rims Carbon DH 32-Hole 27.5 x 40mm Wide
Derby Rims Carbon DH 32-Hole 27.5 x 40mm Wide
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Our Price: $429.00

Product Code: DERBY15-DR27-40DH32-D

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Description Technical Specs
Derby Rims Carbon DH 32-Hole 27.5 x 40mm Wide: Derby Rims have a bead seat retention ridge next to the deep channel around both tire-centering, tubeless ready bead seats. Much like UST bead seat design, the raised bead seat ridges prevents a tubeless tire bead from sliding into the deep center channel and burping while hard cornering. Also the bead retention ridges secure the bead on the bead seat when the tire goes flat, so the flat tire can protect the rim from rock damage while rolling to a stop after flatting. The hookless bead wall with bead seat retention has been used in motorcycle and car tires for decades, but never produced in bicycle rims design before Derby Rims.

Going to wider rims, the tire's circumference doesn't grow taller. They've closely measured rollout curcumference which calculates to tire height, and measured knob width too. Using the same 2.3 Pacenti neo-moto tire on a 650b x 40mm Derby Rims compared to a 28mm Blunt, the tire doesn't grow taller, the tire is no higher at the center knobs, and the edge knobs are actually a very small measurement narrower, about 0.0225 inch or 0.6 mm narrower. But the edge knobs do "stand up" a little higher making a more "square" tread profile, and these edge knobs do come closer to the arch of a fork or yoke of a chain-stay by about 1.5mm, so it is slightly closer clearance above the edge knobs.
Specs & Information
  • BSD: 584mm
  • Outer width: 40mm
  • Inner width: 34mm
  • ERD: 545mm
  • Weight: 485g

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