As my chain and sprockets have nearly reached the end of their life, although not completely worn yet, I have called B&C Express in anticipation of a unexpected failure and was about to re-order same set again. The last 2 kits I've got from them have lasted me a decent amount of miles. The kit I normally get from them consist of their Renthal sprockets and a Tsubachi Gold X-Ring chain.


However I was lucky enough to be answered on the phone by the most knowldgeable person in B&C Express and I asked him what was available that would last me even longer than the last two kits I got from them. He said that there is a new rear sprocket made by Renthal which is made out of Hard anodized alloy and it is expected to be even more durable than their normal alluminium ones.

Renthal�s Hard anodised sprockets feature all the benefits of our regular aluminium rear chainwheels but also have increased resistance to wear. Hard anodising is an integral surface coating, which significantly increases the hardness and wear resistance of the chainwheel surface. Hard anodising is performed under stringent conditions and involves passing an electrical current through the chainwheel whilst submerged in a dilute solution of sulphuric acid at 0∞c. Renthal�s combination of a very high strength base material and an exceptionally hardwearing surface result in significantly increased chainwheel life.


The front sprocket is still the same but the chain is a new product by Renthal called the R4 Road Chain SRS (Self Regulating Seal) here are the specs.


RR4 A Racing Chain
Renthal�s RR4 A highly specialized lightweight 520 sealed ring chain developed exclusively for Superbike racing applications where a combination of lightweight and durability are a must. Utilizes Renthal�s Self Regulating Seal (SRS) technology to increase service life. The specially developed Self Regulating Seal (SRS) ring is preloaded during assembly creating a spring effect. As the chain wears, conventional o-rings and x-rings loose their seal, however the SRS ring has the ability to unload itself during use keeping a tighter seal against the side plates. This offers increased longevity as the specially formulated grease remains trapped around the critical pin and bushing area longer while also keeping dirt, water and other contaminants out.

• SRS ring technology enhances chain flexibility and offers smoother operation than standard o-ring chains
• Chain features high alloy steel plates and pins, solid bushings and rollers, shot peened side plates for added strength and gold side plates
• Chain comes pre-stretched from the factory so less adjustment is needed during initial break in
• Every chain comes with a pair of latex gloves for mess free installation

These are the pics of my new drive kit.
Total price? �114 for the lot as opposed to �93 for Tsubachi x-ring/Alloy Renthal Sprockets.