![RENTHAL REAR SPROCKET MX ULTRALIGHT GROOVED XR50/CRF50 SIL 39T (168U-420-39GRSI) [ONC01] # Seals & Bearings The base of this cylinder](https://cdn.shopify.com/s/files/1/0946/2320/3647/files/168D42039G.jpg?v=1776834473)
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The base of this cylinder must be lapped before installation to insure flattness of the base
* Slim Moto design to fit 1" Handlebars specific for V-Twin Motorcycles
Bar & Shield With Blades adhesive Windshield Sticker
Finished with contrast trim and embroidered open Bar & Shield branding for a timeless H-D look
RENTHAL REAR SPROCKET MX ULTRALIGHT GROOVED XR50/CRF50 SIL 39T (168U-420-39GRSI) [ONC01] # Seals & Bearings The base of this cylinderUltralight Rear Chainwheels Renthal UltraLight Rear Chainwheels are CNC machined in Manchester, UK from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. With Renthal's combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface