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Derby Rims Carbon AM 26 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 circumference 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.
- Technical Details for All Rims:
- Material: UD carbon-fiber
- Spoke holes: 32, 28 normally in stock (email for custom order hole count )*
- *Special order lead time is normally 4 to 6 weeks
- Spoke hole size, offset: 4.5mm (for external nipples), centered.
- Depth: 31mm
- Air valve hole size, length: Presta, 40mm minimum, 44mm recommended)
- Recommended max spoke tension: 105 to 125KgF
- Rider weight limit: 200 lbs / 90kg (XC), 220 lbs 100Kg (AM), 245 lbs 120Kg (DH)
- Max tire pressure: 45 psi (for road use), Maximum recommend for DH race: 32 psi
- Recommended tire pressure, XC hardpack/gravely: 10% rider lbs weight in psi, +2% rear
- Recommended tire pressure, AM rocky trail: (10% rider lbs weight in psi, +2% rear) + 2 to 4 psi each
- Recommended tire pressure, DH rocky race: (10% rider lbs weight in psi, +2% rear) + 6 to 8 psi each
- Tire pressure to seat beads: 35 to 40 psi
- Tubeless rim tape: 18mm or ¾ inch wide sealing tape, only in the center channel.
- Recommended rim tape : Orange Seal 18mm rim tape
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Specs & Information
- BSD: 559mm
- Outer width: 40mm
- Inner width: 34mm
- Channel depth: 8mm
- ERD: 518 mm
- Weight: 440g
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