# TBParts - 189 Race Cam for CRF50 XR50 & Pit bikes

> 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) > [Mini Quad ATC ATV Parts](https://tboltusa.com/store/mini-quad-atc-atv-parts-c-65.md) > [TRX 90](https://tboltusa.com/store/mini-quad-atc-atv-parts-trx-90-c-65_64.md) > TBParts - 189 Race Cam for CRF50 XR50 & Pit bikes
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-189-race-cam-for-crf50-xr50-pit-bikes-p-854.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-189-race-cam-for-crf50-xr50-pit-bikes-p-854.md)
- **Generated:** 2026-11-04 05:55 EST
- **Site guide for AI assistants:** [llms.txt](https://tboltusa.com/llms.txt)
- **Your list:** To list everything you have looked at in one page, with current prices and stock, add ids to this address (comma separated, up to 20 of each): `https://tboltusa.com/store/seen.md?p=854`

All prices are in US dollars (USD). Shipping and any tax are worked out at checkout.

## Summary

- **Part number:** TBW0189
- **Price:** $57.99 USD
- **Stock:** Out of stock. It cannot be added to the cart right now. A person can ask to be emailed when it is back: [Get on the List](https://tboltusa.com/store/contact_us.php?pid=854&stockcheck=true) ([Contact us](https://tboltusa.com/store/contact_us.md))
- **Reviews:** [1 reviews, average 5 of 5](https://tboltusa.com/store/reviews/tbparts-189-race-cam-for-crf50-xr50-pit-bikes-pr-854.html)
- **Product id:** 854
- **Product last changed:** 2026-10-29

## What it fits

The store lists a part under each bike or engine model it is meant for (the categories below) and may name models in the description. Do not assume it fits a bike or engine that is not named here; ask the store first.

- [Mini Quad ATC ATV Parts > TRX 90](https://tboltusa.com/store/mini-quad-atc-atv-parts-trx-90-c-65_64.md)
- [Pit Bike Engine Parts > Camshafts](https://tboltusa.com/store/pit-bike-engine-parts-camshafts-c-51_52.md)
- [TB Parts > CRF50 XR50 Z50 88-Up > CRF50 XR50 Engine parts](https://tboltusa.com/store/crf50-xr50-z50-88-up-crf50-xr50-engine-parts-c-68_73_996.md)
- [TB Parts > CRF70 XR70](https://tboltusa.com/store/tb-parts-crf70-xr70-c-68_77.md)
- [TB Parts > TRX90](https://tboltusa.com/store/tb-parts-trx90-c-68_808.md)

Where a fitment line says "All", it means all years of the model named on that line, not all bikes.

## Description (the store's own text)

High performance race camshaft with NTN bearings. Fits stock head on a CRF50, XR50, XR70, CRF70, TRX90.

**Specifications:**

- 42mm large bearing, 28mm small bearing
- Length - 70mm center to center
- .235" intake valve lift
- 196 degrees of duration @ 050", .218" exhaust valve lift and 208 degrees of duration @ .050"

**Application:**

- Z50 XR50 CRF50 - 1992-Present
- XR70 CRF70 - All years
- TRX90 - All years

## Shipping and returns

- Flat rate shipping is $8 for parts orders under $75 and free for most parts orders over $75, within the continental 48 states. Heavy items (engines, complete bikes, suspension) are excluded.
- Full shipping policy: [Shipping policies](https://tboltusa.com/store/shipping-policies-i-6.md)
- Returns: the store's own policy page says how returns, exchanges and cancellations work. Please read it before buying: [Returns, Exchanges and Cancellations](https://tboltusa.com/store/returns-exchanges-and-cancellations-i-11.md) The page begins: "All products returned to T Bolt USA must be reviewed and approved."

## How to buy

This item is out of stock, so it cannot go in the cart now (see Stock above).

Cart: [Shopping cart](https://tboltusa.com/store/shopping_cart.php)

## Photos

- [Photo 1](https://tboltusa.com/store/img/p/854/tbparts-189-race-cam-for-crf50-xr50-pit-bikes-1.5a556187.jpg)

## Support

Since 2004, every purchase from TBolt USA includes access to technical support from our staff of experts and our online [Pit Bike Technical Info Database](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)!

We have all necessary support parts on hand.

*Most* orders ship same, or next business day, unless otherwise noted above.