For U shape rims braking surface issue last month (the beginning of Sept 2013), it is the clear coat painting on the braking track. So, the painting becomes peeling off after a few days. It is not allow to paint the brake track. The U shape 45mm clincher rim is very popular, there are quite a few orders, and the painting is too busy to finish orders in time, that is why we had one new guy added to do painting on U shape 45mm clincher rims. He is not familiar with painting process. He just paint the road rims the same as MTB rims. He did not know that, for road rims, there will be braking track surface left for braking. The painting can not be applied on the braking track surface. So, one batch of U shape road rims are painted at braking track surface last month. And it caused the braking surface issue. We are very sorry about this issue. Now the painting line has strict process guideline, to prevent similar issue happen again. And the QC department has added "braking track surface check" to the QC check list, no painting material on braking track surface. We know the performance for braking track surface is important for road bicycle rims clincher. Our production problems are fixed, and the braking surface is good now. Here are the pictures we made these days: We are arranging replacement rims for the customers that have braking issue. In the past, there is no this kind of issue for U shape 45mm clincher rims, except the batch of last month .We are very appreciated for the great support for some customers’ support. They trust us , and still accept replacement rims after we solve this issue. For the 45mm U-shape clincher rims shipped before September 2013, there are still no any complaint from customers. They are still riding well. We will keep improving the quality of products and professional service. It is always what we need to do.
After around 8 months testing, the new manufacture process performs much better than the old process. During these 8 months, we get almost no rim crack issue for new process(around 4100pcs new process rims are sold during these 8 months, only a few spoke hole pulled out at the beginning. And after we solved the spoke hole process. We haven't got any rim crack issue). But for the old process, there are some crack issue after customers' a few months riding. So, all wide 29er all mountain rim, 27.5er rim and New 26er DH rim(33mm wide&30mm deep rim) are now all used new process. And For new process rims, only can be available for Light-bicycle. We haven't sold to any other local trade companies. Some trade companies will sell the rims with old manufacture process at cheap price(some are the old process stock ones). If customers likes rim strong & with new process, please contact light-bicycle team. We will provide good rims & good after-sell service for all of you. The first two is for mold serial number. "12" standard for MR12( RM29C07 rim mold). The third letter, " M" stands for matte finish, " G" stands for glossy finish. The next two is spoke count, "32" stands for 32H spoke holes. The coming 6 numbers is for other number on our order list, like "917901" means your order is "917901" serial number on our order list. For the old process & stock ones, it starts with " SDXXXXXXXXX", or without serial number. Because the serial number is invisible sometimes for the old process. The MTB carbon rim manufactured with new process : carbon mountain bike 650b rim mtb 27.5 rim; Wider carbon mountain 29er rims clincher(tubeless-compatible); New 26er 33mm wide enduro MTB all mountain downhill carbon rim tubeless compatible; The MTB carbon wheels manufactured with new process are : carbon MTB 650B wheel mountain bike 27.5 wheels; all mountain 29er carbon mtb wheels clincher tubeless wheel ready; New 26er DH wheels(33mm wide&30mm deep rim)：ready for sell, we are preparing the files to list this product on our website for sell. Thank you for all your kind support, Light-bicycle team( engineers & sales) will keep improving rim quality. Learn more about the new manufacture process for mtb rims.
Several comments have been made about advantages of wheels which are more U-shaped than V-shaped and have a wider spacing between the bike rims. It is a relatively new development. There are some advantages of this bicycle rim design. Fisrt, It will have a straighter line and smoother transition from tire sideway to rim edge, for example; also less bulging of tire walls and make for easier passage of an inflated tire through brake calipers. With standard shaped road bicycle rims, the only design variations generally relate to rim width at the brake track and rim depth, with all other changes moving the road bike rims from a roughly 'V' shape to more of a 'U' shape. With the concept, the maximum width of the rim can be tuned independent of brake track width, while the widest point of the rim may also be moved up or down within the rim cross section. The tire attaches to the prongs of the U. The bottom part of the U is often flat on MTB carbon rims, but can be curved, sometimes even almost pointed, like the bottom of a V. Generally, the more curved or pointed the inner part of the rim is, the more strength it will have. Wheels offer unmatched aerodynamics across the widest possible range of wind conditions, while having the lowest possible cross wind sensitivity. These shapes are also not affected by tire width changes nearly to the effect that other ‘V’ and ‘U’ shaped rims are, allowing the athlete to choose the optimum tire for his/her event, and not have to compromise on a tire around which the wheel was originally designed, in some cases up to 15 years ago. Second, these clincher rims are with non-parallel brake track. The non-parallel brake track did not present a problem for braking. In fact, no need to alter the angle of brake pads. And it is nice to have the solid braking performance on an aero road bike wheelset. The non parallel brake track has been around for a while, it's on Zipp's carbon wheels and some Hed wheels too. This angled brake track will improve the airflow over the tire onto the rim, help toe in the brake pads, and also help to dissipate against heat buildup on the edge of the rim. The benefit of our new U shaped rims are: adding stiffness, due to a slight widening of the rim, and better braking, with a slightly angled brake track, not grew much in weight. And they are light, fast. when hit a few windy sections, it could not fell a thing in the cross winds. non parallel brake track Third, it is tubeless compatible. Customers can choose to setup tubeless on this rim if you ride tubeless. It will be light wheels with tubeless setup. tubeless setup perfectly Buy carbon U-shaped rims now >>
Dear customers, Recently, we find some carbon bike companies copy our website illegally, which significantly affects our reputation and widely misleads customers. Here we make an official statement to clarify that our unique website URL is www.lightbicycle.com. Any other sites,same or similar to our website, are all FAKE. In order to protect the interests of the customer against losses, it's our duty to remind customers to distinguish carefully. We feel honored that our customers present us strong support, but we will be not responsible for the products or related information from the fake websites. Thank you so much! www.lightbicycle.com