# TRC One CNC X4 TX Swingarm Kit

> 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) > [Pit Bike Chassis Parts](https://tboltusa.com/store/pit-bike-chassis-parts-c-50.md) > [Frames & Swingarms](https://tboltusa.com/store/pit-bike-chassis-parts-frames-swingarms-c-50_25.md) > TRC One CNC X4 TX Swingarm Kit
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/trc-one-cnc-x4-tx-swingarm-kit-p-12647.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/trc-one-cnc-x4-tx-swingarm-kit-p-12647.md)
- **Generated:** 2026-11-11 07:59 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=12647`

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

## Summary

- **Part number:** TRC-1703
- **Price:** $359.99 USD
- **Stock:** 3 left.
- **Product id:** 12647
- **Product last changed:** 2026-09-04

## 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.

- [Pit Bike Chassis Parts > Frames & Swingarms](https://tboltusa.com/store/pit-bike-chassis-parts-frames-swingarms-c-50_25.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)

CNC aluminum swingarm kit for a Pitster Pro X4 or SSR "TX" model pit bikes! Works very well on other pit bikes depending on application.

**Key Features:**

- 6061 aluminum extrusion
- CNC machined from extrusions
- Heat-treated to T4 and T6 tempers to optimize its strength and mechanical properties.

**Specifications:**

- Total Length - 18.5inches or 470mm
- Center to center spacing from center of axle slot to center of pivot bolt - 16.5 inches or 420mm
- Pivot axle size - 10mm and 7 7/8inches long or 200mm long
- Width at pivot axle - 4.75 inches or 120.65mm
- Rear axle length - Approximately 9 1/4 inches or 235mm

**Kit Includes:**

- Swingarm axle
- Chain slider
- Chain guide
- Chain adjusters
- Front brake line bracket
- 15mm rear axle - TRC-2048 (225mm long with 38mm wide and 25mm wide spacers)
- 15mm axle blocks
- Pivot bearings 6200-2RS

**Recommended:**

- (For helping with KLX 110 swaps) BBR upper shock mount - 331-KLX-1110 (available on their website)

**Note:** Parts below will allow for upgrade to 12mm pivot axle bolt:

- Swingarm bearings: - 16101-2RS
- Axle (+10mm) - WHS-2375
- Please put your bike on a stand an measure first but customers have used this WHS-1347 rear shock with good results

**Note:**
This is a replacement swingarm for Pitster Pro X4 and SSR TX bikes and similar China bikes
This swingarm will mount to a KLX110 however many many custom fabrications will be needed for the brakes.

**Note:** HARDWARE IS NOT INCLUDED. This kit only comes with what is shown and listed.

## 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

For a person: open [TRC One CNC X4 TX Swingarm Kit](https://tboltusa.com/store/trc-one-cnc-x4-tx-swingarm-kit-p-12647.html), choose any options, press "Add to Cart", then check out from the cart. Payment is only ever entered by the person, on tboltusa.com's own checkout pages.

For an AI assistant building a cart: `https://tboltusa.com/cart/new/item/12647/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart/<cart_code>/add/item/12647/qty/1` adds it to a cart you already started, and `https://tboltusa.com/cart/<cart_code>/zip/<ZIP>` gives the shipping options to a US ZIP code. They answer JSON: give your customer the newest `cart_link`, a public cart link, safe to share.

Or give the person one link that fills their own cart when they open it (a public cart link, safe to share; the first value of every option, qty 1): [Put TRC One CNC X4 TX Swingarm Kit in my cart](https://tboltusa.com/cart/open/item/12647/qty/1)

Payment: all major credit cards, PayPal, Apple Pay and Google Pay. Money orders by arrangement.

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

## Photos

- [Photo 1](https://tboltusa.com/store/img/p/12647/trc-one-cnc-x4-tx-swingarm-kit-1.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.