Wider bead hook-less carbon rims 26er DH/AM & 27.5er (650B) AM & 29er AM/XC - NEWSLETTER - Carbonbicycle Online Shop
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Wider bead hook-less carbon rims 26er DH/AM & 27.5er (650B) AM & 29er AM/XC

Many customers prefer to try this new wider bead hook-less carbon rims  26er (DH/AM width 33mm) & 27.5er (650B) (width AM 35mm) & 29er (width AM 35mm/30mm & XC 27mm). Please find as below rim specs and cross section diagrams.

cross-section diagram hookless MTB carbon rims 26er DH/AM 33mm widecross-section diagram hookless MTB carbon rims 27.5er (650B) AM 35mm widecross-section diagram hookless MTB carbon rims 29er XC/FR 27mm widecross-section diagram hookless MTB carbon rims 29er AM 30mm widecross-section diagram hookless MTB carbon rims 29er AM 35mm wide 

Of course, it is important for us to understand first how to secure the tire without any bead hook. Actually hookless rim design is not new, such design has been put on automotive wheels for quite a long time. It is also hook less design & using tubeless tire. Now hook less design is started to used in bicycle rims. The following pictures illustrate the inside views of these wider bead hook-less carbon rims 26er (DH/AM width 33mm) & 27.5er (650B) (width AM 35mm) & 29er (width AM 35mm/30mm & XC 27mm).

Bead hook less MTB carbon rims 26er 27.5er 650B 29erBead hook less MTB carbon rims 26er 27.5er 650B 29er 

This rim is without bead hook, it is ok to hold tubeless and tubeless-ready tires. No need to use hook less ready tires. Our engineer started to study hookless design quite a long time ago. There is similar rim on the market, there is zero issues of holding tires for hook-less rims.

The rim wall is more smooth and straight, the tire will touch rim walls fully and mounted perfectly.We have set up tubeless tire on it. It works well, absolutely zero air leaks.

Compare to head hook design, the hook less design is more durable. Because the rim wall structure is simpler. Then carbon fiber will be more continuous. It will be stronger than a hooker carbon rim at the same weight.

test of bead hook less MTB carbon rims 27.5er (650B) & 29er

The testing data for spoke hole NO.1: around 374.26kgf, the nipple cracked, there is no crack on rim spoke hole

test of bead hook less MTB carbon rims 27.5er (650B) & 29er

The testing data for spoke hole NO.2: around 305.68kgf, the spoke cracked, there is no crack on rim spoke hole

Since the spoke & nipples are crack while testing, we can not get the max spoke tension of spoke holes. But we get the result the spoke holes can hold more than 300kgf tension.

Rim Impact test:

carbon 29er hook less rim impact test
test of bead hook less MTB carbon rims 27.5er (650B) & 29er

While the load is around 172.98kgf, the rim cracks at the vale hole area. (Pass: CB stiffness standard is 150kgf)


Carbon hook-less 29er rim impact test data sheet
Max load Max Elongation Energy absorption Breaking strength Test time Max displacement Max Elongation
172.98kgf 47.07% 4563.50kgf.mm 18114.96kPa 4.89min 49.03mm 47.07%
If customers like to build light and strong 27.5er and 29er bikes for AM & XC riding, this rim is the good choice. It is pretty light & strong. It will become popular for light weight and strong 27.5er and 29er wheels & no tubes 650B and 29in wheelsets.

The following is the pricing of our wider bead hook-less carbon rims 27.5er (650B) & 29er.

Price 26er bead hook less rim (width DH/AM 33mm): 145 USD/piece

Price 27.5er & 650B bead hook less rim (width AM 35mm): 155 USD/piece

Price 29er bead hook less rim (width AM 35mm & XC 27mm): 145 USD/piece


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