Specifications: Material: toray t700 full carbon type: clincher tubeless compatible & hookless Rim depth: 30mm external width: 33mm Internal width: 26mm brake system: disc brake Application: cross country(xc) weight: 430¡¡§¡è15g Erd: 579 bsd: 622 Spoke hole offset: 2.8mm spoke hole dia: 4.3mm Assembly hole dia.: 7.5mm valve hole dia.: 6.5mm Lead time: 5-15 days standard: en standard Why boths the offset rims: Solve the problems of a bike chain's side is weighter the other side.As we are know, mostly in the chain side is weight than another side..Offset rims.Can improve the chain-side weight.It can insure the rims weight center point is in the centeral.From the cyclists reviews used more smoothly and fastest than usually. Design characters: Ø hookless: by getting rid of the hook from the top of the rim sidewall, the rim wall became smooth and straight, it is easy to install a tire, and the tire and rim will work perfectly to create a seal. So riders are allowed to run lower tire pressure without the risk of air loss or pinch flats. Ø tubeless compatible: this allows to run tubeless perfectly, makes wheels superlight. Ø filled with 3d weave, that will make the rim stable, safe and durable. Ø these rims build up into stiffer, stronger and more reliable wheels by improving the bracing angles of a dished wheel and equalizing the spoke tension.