Wow. I feel so good hearing so many positive vibrations!
Other than my day job, and a short 2 hour ride before dark tonight, since announcing the Grand Opening till now I've been non-stop replying to emails from derbyrims.com and filling orders.
The first day was great! the 650b is outselling 29'r by 250% !
They appear to be hookless. Is that correct?
Yes these are "Hookless":
With tubeless ready bead seat design, tightly centering the tire around a rim, the upper bead hook is useless, even when using tubes, and weakens a rim, especially carbon rims. The clincher side hooks were useful when rims had no bead seats for centering the tire around rims as they aired up. Have a look at the Specialized Roval carbon rims, they have returned to having no side bead hooks. This is really an older rim design, the side hooks or "clincher" bead hooks, first became used in the early '70s when high pressure inner tubed road tires had trouble centering on the rim when airing up to 65+ psi and would blow off the rim sooner or later. Centering a tire is not a problem now with the tire centering TR inner bead seats now common. And my rim side walls rise 6mm above the bead seat, slightly more than most aluminum rims also keeping loosely beaded tires on the rims when aired up. There rims can easily take 80psi.
Also, notice the Bead locks:
Notice my rims have a bead seat locking "lump" or ridge next to the deep channel around both bead seats. Much like UST bead seat design, this keeps a tubeless bead from sliding inward into the channel and burping while hard cornering. Also the bead locks keep 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.
Really cool looking rims. Are they made in the USA?
Designed here in the USA, and assembled here (well the sticker is applied), and they are shipped from here, all by me : ) There's no way I could afford to produce them in the USA. No other CF rims except ENVE are made here, and rumor is they are getting some rims made in China soon. ....If any consolation, I'm not sourcing rims outside of this world... yet!
The rims look pretty nice. May I ask where they are made?
I'm sorry, it is confidential.
Good luck with your venture. Personally, I am looking for something in similar widths that have a UST bead profile. I reserve the right to change my mind but I would be a late adopter.
The problem with strict UST design is sharp hooks require cutting the fibers or using only resin with would crack easily. My opinion and it is well demonstrated that the side hooks are useless when there is a platform or flat bead seat centering the tire's bead. I did design the seat to have bead locking "lumps" around each bead seat next to the channel, somewhat like UST's seat hooks preventing bead squirm and burping during hard cornering. I'm over 200 lbs and 6'1". I've landed many time some moderate drops to near flat without burps with my rims, where the same landing would sometimes burp the same tire with rims I previously rode without bead locks and where only ghetto (split and trimmed inner tube) rim strips prevented burps previously for me. And the rim wall is 1mm diameter taller than many rims for holding loosely beaded tires on safely.
doismellbacon and flyinmike said:
Congrats and good luck Derby... I appreciate all your contributions to the community here....especially for leading the way with all your early 650b Mojo tinkering.
Questions:
What's the internal width on the 650b rim?
How does that play with a tire on the narrower end of the all conditions spectrum, like a Neo Moto 2.1, Racing Ralph 2.25, or CrossMark 2.1? Is it all good, or are the wide rims better suited to the nuevo-massive breed of tires like Hans Dampfs, Trail Kings, etc.?
Thanks dois' and flyin" !
The rim walls by the beads are 3mm, thicker that any other, and Unidirectional fiber for maximum durability resiting chips and cracks. On the web site is a picture where I snake-bit my tubeless Noe-moto landing a jump on a sharp rock and the picture shows what casing the rim did. Although a substantial divot, like hit by an axe, no chipping, no crack, no rim repair was needed. I believe my rims are DH/FR durable. And they are coming in weighing mostly about 435 grams in the 650b x 40mm wide now.
And also reply to 88 rex:
2.1 tires are no problem, the casing is better optimized in performance as well as using larger width tires, with 2.1 tires and these wide rims the casing stiffens under the edges of the tread, lower pressures are enabled for increased traction and easier rolling over rocks. Under 2.0 width tires are really to minimize tire weight and minimize tread contact for lowering rolling resistance on pavement and smooth hard pack dirt surfaces. A narrow road width rim is better for such minimal tread contact goals, narrower rims reduces the tread contact patch by forcing to air up higher pressures for stability.
Measured a Racing Ralph 2.25 at 2.2" width on the Derby 29 x 35 rims. Running them at 18Front 19psi rear for a 180 lb rider. It is a different world of off road traction and bump compliance.
H
Endless thanks Hans. And more thanks for bringing Ibis back to a thriving life and raising the standard of quality for trail bikes today, without inflating the prices of your frames.
They look great, I want some and I don't even own a 27.5!
Hey ScottW, they also are available in 29'r x 35mm ! Coming in about 445 grams on average now.
Thanks everyone! .... I'll check back when I can come up for air again and relax here.