Choosing the right rear wheel spacers for a pit bike improves stability, aligns the rear wheel with the sprocket and brake rotor, and ensures the axle fits correctly across engine sizes. This guide reviews five reliable spacer kits suited for 12mm and 15mm axles on common XR/CRF 50 and other Chinese dirt bikes. Each option includes spacers and, in some cases, bearings for smoother rotation. Read on to compare specifications and pick the best match for your bike.
| Product | Brand | Key Feature |
|---|---|---|
| PIT PRO Trail Dirt Bike 15mm Wheel Spacer Set | Greesp | 15mm axle compatibility; multiple thickness spacers (18mm/18mm/25mm/28mm); 22mm OD |
| 12mm 220mm Rear Wheel Axle With Spacers | Greesp | Axle length 220mm; XR50/CRF50 fit; 12mm spacers for 50cc–150cc bikes |
| TDPRO Pair 6202 RS Bearings With Rear Spacers | TDPRO | Includes bearings and rear spacer; 12mm axle spacers; 84mm total length |
| sthus 15mm 255mm Rear Wheel Axle With Spacers | sthus | Length 255mm; 15mm diameter; fits 110cc–160cc pit bikes |
| Amavoler 12mm 210mm Rear Wheel Axle With Spacers | amavoler | 210mm axle; 12mm spacers; aftermarket replacement parts |
PIT PRO Trail Dirt Bike 15mm Wheel Spacer Set
The PIT PRO 15mm wheel spacer set from Greesp focuses on a simple, flexible fit for dirt bikes with 15mm axles. The kit supports multiple thickness spacers, enabling precise rear-wheel alignment across a range of models and hub configurations. With an outside diameter of 22mm and an inside bore of 15mm, the spacers are designed for consistent hub engagement and reliable torque transfer during aggressive riding.
- Axle compatibility: 15mm
- Outside diameter: 22mm; Inside diameter: 15mm
- Includes spacers in several thicknesses to tailor fit
- Suitable for 50cc to 160cc dirt bikes
Riders who swap wheels or work with aftermarket hubs may find this kit convenient due to its breadth of spacer options. Proper installation ensures the rear wheel remains square with the swingarm and drivetrain. Always verify clearance with the brake rotor and chain while assembling.
12mm 220mm Rear Wheel Axle With Spacers
Greesp’s 12mm rear wheel axle with spacers presents a straightforward option for XR50/CRF50 and similar clones. The product lists a 220mm axle length, making it compatible with a wide range of 50cc to 150cc dirt bikes commonly used in pit riding. The kit’s spacers are designed to sit between the wheel hub and the swingarm, contributing to proper chain alignment and rotor spacing.
- Axle diameter: 12mm; axle length: 220mm
- Fits XR50/CRF50 and clones; suitable for many Chinese dirt bikes
- Includes spacers for front and rear axle setups
When installing, confirm that the overall axle length accommodates your wheel, sprocket, and brake rotor without interference. Tighten fasteners to the manufacturer’s torque specs to maintain alignment through terrain changes and hard landings.
TDPRO Pair 6202 RS Bearings With Rear Spacers
TDPRO’s bearing and spacer package targets a tidy, maintenance-friendly upgrade for 15mm to 12mm pit bike axles. The kit includes two ball bearings plus a rear spacer, with spacers sized to accommodate 12mm front and rear axles. The total length is 84mm, providing a compact fit that minimizes excess spacer material while still delivering improved alignment and reduced play in the drivetrain.
- 12mm axle spacers and bushes included
- Axle diameter: 12mm; total length: 84mm
- Package includes: 2 bearings + 1 rear spacer
Bearings included in spacer kits can reduce wear on the axle and hub, helping maintain smooth rotation under vibration and impact. Ensure you match bearing sizes to your specific axle type and confirm clearance with the wheel and brake components before tightening.
sthus 15mm 255mm Rear Wheel Axle With Spacers
The sthus kit offers a longer axle option, measuring 255mm in length with a 15mm diameter. It is positioned for 110cc to 160cc pit dirt bikes and weighs about 440g, which can influence stiffness and alignment under load. This spacer/axle combination can be advantageous for riders who need a precise spacer length to clear chain tensioners or brake components on wider swingarms.
- Axle length: 255mm; diameter: 15mm
- Designed for 110cc–160cc pit bikes
- Weight around 440g
When selecting a longer axle, verify plenty of clearance between the wheel, chain, and brake rotor, especially on bikes with extended swingarms or aftermarket sprockets. Recheck alignment after initial ride and re-torque as needed.
Amavoler 12mm 210mm Rear Wheel Axle With Spacers
Amavoler offers a straightforward aftermarket option with a 210mm rear axle and 12mm spacers, marketed as an aftermarket replacement part for pit dirt bikes, mopeds, scooters, and quad bikes. The kit’s simple design emphasizes compatibility and durability, making it a practical choice for riders who want a reliable spacer system without added complexity. The notes mention suitability for several small platforms, including mini bikes and ATVs.
- Axle length: 210mm; diameter: 12mm
- Aftermarket replacement part for pit bikes and similar platforms
- Built for long-term use with standard 12mm axle spacers
When integrating this spacer set, ensure proper alignment with the wheel hub and rotor. If you use additional bearings or sleeves, confirm the fitment and lubrication needs to maintain smooth operation and reduce wear on the axle assembly.
TDPRO 15mm Front Rear Wheel Spacers For Pit Dirt Bike
TDPRO’s 15mm spacer kit is tailored for front and rear wheel applications on XR/CRF 50 and other dirt bikes in the 70cc–110cc range, with a 15mm axle compatibility that supports 125cc and 160cc models as well. The kit includes two 12mm spacers and a set of bearings to ensure consistent alignment across front and rear axles. This is a comprehensive option for riders who want a uniform spacer solution across the bike.
- Axle diameter: 12mm; spacer diameter: 15mm
- Includes 4 bearings + front and rear spacers
- Designed for 15mm to 12mm axles
Installation should consider both the front and rear hubs to avoid imbalances in steering response. Proper torque and alignment checks are essential when using a mixed-bore kit across different wheels and hubs.
15mm Front Rear Wheel Axle Spacers For Chinese Pit PRO Trail Dirt Bike
This Greesp kit is designed specifically for 15mm rear wheel axles on Pit PRO Trail dirt bikes, with a 235mm rear axle length and spacers that measure 25mm/34mm. It provides a precise fit for XR XR50-style machines as well as various 70cc to 110cc bikes. The configuration aims to deliver solid wheel alignment and stable hub engagement under heavy riding conditions.
- Rear axle length: 235mm; 15mm diameter
- Spacers: 25mm and 34mm options
- Targets XR/CRF 50 and related pit bikes
When assembling, verify that the chosen spacers do not interfere with the chain and brake components. If necessary, adjust the sprocket alignment to maintain proper chain tension and rotor clearance during operation.
Buying Guide
Key considerations help determine which rear wheel spacer kit is best for your pit bike. The following points address sizing, compatibility, content, and installation to support a balanced, durable setup.
Spacer size and axle compatibility
Most pit bikes use 12mm or 15mm axles, with common spacer lengths ranging from 210mm to 255mm. Measure your axle diameter and the available clearance between the wheel, sprocket, and brake rotor. If you run a wider swingarm or larger sprocket, you may need a longer axle or extra spacers to maintain proper alignment without rubbing.
Kit contents: spacers, bearings, sleeves
Some kits include only spacers, while others combine spacers with bearings or sleeves. Bearings can reduce friction and wear, especially on high-load rides. Review what is included to avoid purchasing redundant components and to ensure you have everything needed for installation.
Material and build quality
Durability matters for off-road riding. Spacers are typically metal and must resist impact, heat, and corrosion. While many listings do not specify material, look for kits with solid machining, consistent bore diameters, and clean surface finishes to minimize hub wear and ensure smooth rotation.
Length, diameter, and alignment impact
Axle length and spacer diameter influence alignment and chain line. A spacer that’s too long can push the wheel out of alignment, while a spacer that’s too short may cause rotor or chain interference. Always verify compatibility with your specific model, and adjust the chain tension and brake alignment as needed after installation.
Installation tips and maintenance
Follow torque specs and use appropriate fasteners. After initial riding, recheck torque and wheel alignment. Periodic inspection of spacers for wear, rust, or deformation helps prevent failure under load. If you ride aggressively or frequently jump, inspect the spacer area for signs of play and replace worn parts promptly.
Brand reliability and warranty
Choose brands with a track record of dirt bike components and reasonable return policies. If a kit includes bearings or sleeves, confirm compatibility with your hub and axle before purchase. A warranty can provide added confidence when upgrading critical drivetrain parts like spacers and bearings.
In summary, the best spacer kit depends on your bike’s axle size, the desired chain line, and whether you prefer spacers alone or a bundle that includes bearings. Compare the listed contents carefully, verify compatibility with your model, and ensure proper installation to maximize wheel stability and drivetrain efficiency on the trail.