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 Titanium 6AL-4V Chainring bolt on the market.
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 6AL-4V Titanium 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.
Titanium Bolts come with 1oz of Finishline Ti-Prep anti seize packet.
Note: Rennen Products will be shipped to you separately from any other items ordered on BRGstore.com and will ship direct to you from from Rennen. Rennen products are made to order, due to the options of sizes and colors. Each order will be produced once ordered and will be shipped to you when ready, but the production time could be extended up to 2 weeks on some orders, depending on Rennen’s production schedule. All Rennen purchases are a final sale due to the method of order from BRGstore.com and are not eligible for return or refund.
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.