DirtyBike 420 Primary Chain Drive Alignment Shim Surron LBX

Is your primary chain drive louder than you think it should be? The Sur-Ron Light Bee frame varies over time and when you install a primary chain drive you may find that the alignment from the motor sprocket to the primary driven sprocket may be off. This causes a lot of noise and premature wear on the sprockets and the chain. Bring those sprockets back into alignment with the db DirtyBike primary driven sprocket shim. Shims are 1mm thick aluminum and most bikes usually only need one shim. Shim goes in between the driven sprocket and the jack shaft. See the installation instruction page for more details.

Please verify your bike model and year before purchasing. If you have questions about fitment, contact us at info@elektrischesracing.com or use the chat below — we’re riders, and we’ll help you get the right part.

Most kits are plug-and-play. Installation guides are included in the box and available on our YouTube channel. For complex installations, we recommend watching our installation videos before starting.

Will this fit my bike?
Check the product title and description for compatible models. Contact us if unsure.

How long does shipping take?
Most orders ship within 1-3 business days from Laguna Beach, CA. Free shipping on orders over $200 (Lower 48).

Do you offer financing?
Yes! Shop Pay Installments and Affirm are available at checkout.

What’s your return policy?
We accept returns within 14 days on unused items in original packaging.