Rennen Infinity Chainring Al Bolts 4pcs Black

Description

Rennen Infinity Bolts are the latest product developed out of the Rennen headquarters. Rennen took one of the simplest components on a BMX bicycle “The Chainring Bolt” and Rennen made it better.

Rennen has done it again with the Infinity Bolt. A simple but very effective shoulder just under the head of the bolt serves to distribute the load and make this the strongest 7075 Aluminum Chainring bolt on the market.

Chain Ring Bolt Lenghts
Regular: 6.2mm
XL:9mmChain Ring Nut Lenghts
Regular: 6.2mm
XL:9mm

While all other bolts on the market use a 5mm internal hex we chose 4mm to provide more material and increasing their strength further by 8.5%

At Rennen we like improving things that are not obvious and we believe we have achieved that with the Infinity Chainring Bolt.

Rennen are so confident in this design we are offering a lifetime warranty against breakage. That’s right break a bolt and get a new one.

For something as simple as a chainring bolt we ran this design through 97 CAD iterations, 22 CNC G-Code variations and numerous FEA simulations.

We purchase USA made 7075-T6 and produce these on a state of the art multiaxis CNC lathe in house. We do things this way because we have full control over our designs and production, and the alternative of ordering parts out of a catalog is unoriginal and boring.

Rennen stands by their designs and products, the quality shows.

Chainring Bolts use a 4mm/8mm allen wrenches for assembly.

Regular length has been optimized to work with most gear crank combinations.

XL is specifically designed for thick crank spiders like Answer Accelerator cranks.

We use Finite Element Analysis (FEA) to virtually test the design and rapidly iterate through concepts.
In this first Image we are showing in an exaggerated view what happens when a load is applied to the spider and transmitted through the gear. This is a design with no shoulder. Here you can see concentrated stress.

Our second image is demonstrating the effects of the shoulder. Notice how there is more distribution of stress and the regions of high stress are not as pronounced.
We look to improve designs that have been in existence for decades.
We have improved the Chainring bolt and we at Rennen hope you appreciate the effort.