# Pit Bike and Motorcycle CHAIN sizing

> This is a plain-text (markdown) copy of a page on tboltusa.com, made for AI assistants. People see the same page at the HTML link below.

- **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Tech Database home](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md) > [Identifying Parts, Bikes, and Engines](https://tboltusa.com/store/identifying-parts-bikes-and-engines-tech-96.md) > Pit Bike and Motorcycle CHAIN sizing
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/pit-bike-and-motorcycle-chain-sizing-tech-76.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/pit-bike-and-motorcycle-chain-sizing-tech-76.md)
- **Generated:** 2026-11-10 13:57 EST
- **Site guide for AI assistants:** [llms.txt](https://tboltusa.com/llms.txt)

This is an article from the TBolt USA Tech Database, the store's free online library of pit bike technical info. The text below is the article as written.

## Article

Here is some Quick info on Chain sizing
Check you size before ordering

Most Pit Bike take 420 chains:
CRF50
XR50
KLX110
SSR

Some take 428
EXTREME
SOME Pitster
SOME OGM

Roller sizing:
420 = 7.7mm
428 = 8.5mm

![image](https://tboltusa.com/Tech_Data/uploads/images/Chain.JPG)

## Tech Database sections

- [Tech Database home](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)
- [Pit bike Buying and Ownership info](https://tboltusa.com/store/pit-bike-buying-and-ownership-info-tech-98.md)
- [Pit Bike Wiring Info](https://tboltusa.com/store/pit-bike-wiring-info-tech-56.md)
- [General Motorcycle Maintenance](https://tboltusa.com/store/general-motorcycle-maintenance-tech-95.md)
- [General Motorcycle Troubleshooting](https://tboltusa.com/store/general-motorcycle-troubleshooting-tech-97.md)
- [How Things Work](https://tboltusa.com/store/how-things-work-tech-115.md)
- [Identifying Parts, Bikes, and Engines](https://tboltusa.com/store/identifying-parts-bikes-and-engines-tech-96.md)
- [Parts Diagrams and Breakdowns](https://tboltusa.com/store/parts-diagrams-and-breakdowns-tech-120.md)
- [Pit Bike Installation Info](https://tboltusa.com/store/pit-bike-installation-info-tech-99.md)