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Mountain and Gravel Rim Spec's
29er (700c)
27.5 (650b) & 26"
27.5 (650b) & 26"
- 29" (700c) CX 25i & Sol Rider (29" x 25i SR)
- XC layup. 24H, 28H, 32H, or SR 24H, 28H, 32H
- - ideal for 1.8 to 2.3 XC tires under 700g
- Weight +/-10: 450g
- Outer width: 29mm, Inner width: 25mm, Depth: 32.5mm
- ERD: 582mm
- 29" x 30i & Sol Rider (29" x 30i SR)
- xc.TRail 28H, 32H, enduro.DH 32H, or SR 28H, 32H layup options
- - ideal for 2.0 to 2.3, & up to 2.6 tires
- Weight +/-10: 495g [TR & SR] or 590g [DH]
- Outer width: 36mm, Inner width: 29.5mm, Depth: 31mm
- ERD: 584mm (DH add 1mm)
- 29" x 35i & Sol Rider (29" x 35i SR)
- xc.TRail 28H, 32H, enduro.DH 32H, or SR 28H, 32H layup options
- - ideal for 2.3 to 2.6, & up to 2.8 tires
- Weight +/-10: 515g [TR & SR] or 630g [DH]
- Outer width: 40mm, Inner width: 34.5mm, Depth: 31mm
- ERD: 584mm (DH add 1mm)
- 29" x 40i - for 29-Plus tires and frames
- xc.TRail 32H, enduro.DH 32H layup options
- - ideal for 2.6 to 3.0 & up to 3.5 tires
- Weight +/-10: 530g [TR], 595 [Enduro]
- Outer width: 45mm, Inner width: 39.5mm, Depth: 31mm
- ERD: 584mm
27.5 (650b) & 26"
27.5 (650b) & 26"
27.5 (650b) & 26"
- 27.5" (650b) BX 25i
- XC layup 28H, 32H
- - ideal for 1.8 to 2.3 XC tires under 650g
- Weight +/-10: 415g
- Outer width: 31mm, Inner width: 25mm, Depth: 32.5mm
- ERD: 542mm
- 27.5" x 35i & Sol Rider (27.5 x 35i SR)
- xc.TRail 28H, 32H, enduro.DH 32H, or SR 28H, 32H layup options
- - ideal for 2.3 to 2.6, & up to 2.8 tires
- Weight +/-10: 490g [TR & SR] or 580g [DH]
- Outer width: 40mm, Inner width: 34.5mm, Depth: 31mm
- ERD: 546mm (DH add 1mm)
- 27.5" x 40i - for 27-Plus tires and frames
- xc.TRail 28H, 32H, enduro.DH 32H layup options
- - ideal for 2.6 to 3.0 & down to 2.4 tires
- Weight +/-10: 540g [TR] or 580 [Enduro]
- Outer width: 45mm, Inner width: 39.5mm, Depth: 34mm
- ERD: 542mm
- 27.5" x 45i - for 27-Plus tires and frames
- AM/xc.TRail 32H, Enduro 32H layup options
- - ideal for 2.8 to 3.0 & up to 3.8 tires
- Weight +/-10: 530g [AM/TR], 560 [Enduro]
- Outer width: 50mm, Inner width: 44.5mm, Depth: 34mm
- ERD: 538mm, Note: Spoke off-set from rim center: 5mm
All Rims
- Material: UD carbon-fiber
- Spoke holes - Mountain: 32, 28, 24 (SR & CX 25i only)
- Spoke hole size: 4.5mm (for external nipples)
- Spoke hole alignment (picure above), for all rims: Centered aligned, All rims have spoke holes angled towards hub flanges. Key/First spoke: Stand up the rim vertical as if ready to roll forward, with valve hole at the ground. Looking down at the valve hole, the 1st spoke hole forward of the valve hole angles to the right-side hub flange, next spoke hole forward angles to the left side hub flange, etc.
- ERD lengths are measured to include full length of nipples, ie. top of nipples, filling nipple driver slots as described here:http://www.sheldonbrown.com/rinard/spocalc.htm#MeasureHubAndRim, and http://www.youtube.com/watch?v=DVpW3Kd1HgI
- Presta valve hole, required valve stem length: 44mm minimum
- Recommended max spoke tension: 125KgF
- Recommended rider weight limit: 175 lbs / 90kg for XC (CX & BX) rims, 225 lbs 100Kg for xc.TRail, 300 lbs 135Kg for enduro.DH rims
- Max tire pressure (mountain): 32 psi (for road use of mountain rims), 22 psi for 2.6 and larger tires. Max for enduro.DH race/park/shuttle: 30 psi
- Tire pressure to seat beads of most new tires, with soapy water or bead seating lubricant: 35 to 40 psi for mountain rims
- Tubeless rim tape maximum recommended width: 14mm for 25i, and 30i rims; 20mm for 35i; 20-30mm for 40i and 45i rims; Only tape within the center channel, do not taping over the bead seats for best results.
- AM/Trail (the "new XC") Derby rims are for technical-trail riding, no large drops or enduro high speeds
- Enduro racers and any high speed trail riders, should use a Derby DH rear rims
- XC, xc.TRail, or enduro.DH - Which type?
- The 30i xc.TRail Derby Rims are about the same weight as 22mm inside wide major brand's "light weight" XC aluminum rims.
- The external design and all dimensions of the rims are the same for either XC layup, xc.TRail layup, or enduro.DH layup, for each wheel size. Additional carbon-fiber layering inside the hollow "double-wall" rims is thicker and stronger than XC in the xc.TRail and further reinforced enduro.DH options. The DH layup is about 40 to 90 grams heavier in carbon-fiber than the xc.TRail layup.
- CX, BX (Cross-Country) layup Derby rims are for small light weight tires under 650 grams and 2.3 maximum tire size, with short knobs or semi slicks for mainly smooth hard pack and gravely conditions, and where wheel rolling climbing weight and acceleration is more important than descending control. Although DH bike riders call their 6-inch travel Enduro-DH bikes their "XC bikes", use of aggressive tires more than 2.3 and 650 grams is not "XC".
- xc.TRail layup Derby rims are for technical trail medium size knob tires under 800 grams, (except if plus size) for technically difficult trails and where climbing wheel weight and rear tire rolling ease is as important as descending control, through rocks or roots with rare in-trail small drops less than 2 foot vertical. Free-ride larger drops and stunts and Enduro-DH high speeds are not xc.TRail layup technical trail conditions, for such extreme riding enduro.DH layup rims are required for shuttle and DH park and for the rear wheel for Enduro and DH racing and similar descending high speeds.
- enduro.DH layup Derby rims are for maximum durability under the hardest riding conditions for any weight rider of extremely rocky trails and large drops and jumps. "DH" Derby rims are required for DH bikes, and required for at least the rear wheel of Enduro bikes for Enduro racing and similar high speed descending uses. Also enduro.DH layup Derby rims are required for tandem mountain bikes, and mountain E-bikes, and riders over about 250 lbs.
- Rider weight is not a major factor for durability. Sharp rock hits and suspension bottoming loads focus more than 1000 lbs of acute input causing flex to a rim. Aluminum rims could bend or dent from sharp or heavy hits, but carbon-fiber will flex. And excessive flex and repeated excessive flex damage carbon rims. Usually excessive flex causes internal damage at first, called "micro-fracture", where the actual carbon fibers split microscopically. Additional excessive and normally intended flex will open the internal fracture further, until the internal layers separate enough to become unable to support intended loads, and many months later after the initial excessive hit flex the rim wall collapses showing as a surface crack.
- Derby Rims are not for weight weenies. These very wide trail rims are for high performance bike handling, improving the performance of nearly any trail tire. The xc.TRail rims are about 0.75 lb, about 300 grams lighter per set than an equivalent width aluminum rim. This is a huge weight improvement in rolling weight. With wide Derby Rims there are additional effective ways to reduce weight. Some examples: Wide rims with smaller tires have more traction and cornering grip than a high volume tire with bigger knobs on narrow 25 mm internal width rims. And Sapim CX-Ray spokes drop about 100 grams compared to common double-butted spokes.