Jingzan Bicycle Axle Extenders for Training Wheels, 2 Pack 304 Stainless Steel Extension Bolts with Self-Locking Washers($8.99Value)

Description

【EXACT 3/8"-26 TPI THREAD】 — CHECK BEFORE ORDERING: Designed only for bicycle rear axles with a 3/8"-26 TPI thread, approximately 9.53 mm nominal diameter and 0.98 mm thread pitch. Not compatible with 3/8"-24 TPI or M10 x 1.0 axles. Please verify the original axle nut, bicycle manual or thread pitch before purchasing. 【EXTENDS SHORT REAR BIKE AXLES】: These bicycle axle extension bolts add usable axle length when the original solid rear axle is too short to securely mount compatible training wheel brackets. A practical solution for installing stabilizers without replacing the complete rear axle. 【UPGRADED SELF-LOCKING WASHERS】: Includes 2 paired 304 stainless steel self-locking washer sets. The interlocking double-stack design helps resist vibration-induced loosening and provides a more secure connection than ordinary flat washers when correctly installed and tightened. 【DURABLE 304 STAINLESS STEEL】: Both the axle extenders and locking washers are made of corrosion-resistant 304 stainless steel for dependable strength and long-term outdoor use. Precision-machined threads provide smooth engagement with a correctly matched 3/8"-26 bicycle axle. 【COMPATIBLE HUB FAMILIES】Designed for compatible solid threaded axle versions of Shimano Nexus, Shimano Alfine and Shimano Coasting hubs that use a 3/8"-26 thread. Compatible hub references include Shimano Nexus SG-3C41-DX and SG-C6000-8C / SG-C6000-8CD when equipped with their original 3/8"-26 solid threaded axle. This compatibility is based on the hub and axle configuration, not the bicycle brand name alone.

Bicycle Axle Extenders for Training Wheel Installation

These bicycle axle extenders are designed to add usable length to compatible solid rear axles, helping create additional mounting space for training wheel and stabilizer brackets when the original bicycle axle is too short.

Multiple Thread Options Available

Different bicycles may use different axle thread standards. Available variations include:

3/8"-24 TPI
3/8"-26 TPI
M10 x 1.0

Please select the exact thread specification that matches your bicycle rear axle. These thread sizes may look very similar but are not interchangeable. Bicycle brand, model and wheel size alone cannot reliably confirm compatibility.

Before ordering, check the specification of the original axle nut, consult the bicycle manufacturer or use a suitable thread gauge. A standard caliper may measure the approximate axle diameter, but it may not accurately distinguish between similar thread pitches.

Upgraded Self-Locking Washer Design

Each set includes two paired 304 stainless steel self-locking washer sets. The interlocking double-stack design helps resist vibration-induced loosening and supports a more secure training wheel installation when the washers are correctly positioned and the hardware is properly tightened.

Durable 304 Stainless Steel

The bicycle axle extenders and self-locking washers are made of durable 304 stainless steel for reliable strength, corrosion resistance and long-lasting outdoor use. Precision-machined threads help provide smooth engagement with a correctly matched solid rear axle.

Helps Extend Short Bicycle Axles

These extension bolts provide a practical solution when the existing rear axle does not leave enough exposed thread for mounting compatible training wheel brackets. They can help avoid the need to immediately replace the complete bicycle rear axle.

Package Includes:
2 × Bicycle Axle Extenders
2 × Paired 304 Stainless Steel Self-Locking Washer Sets

Basic Installation:
1. Confirm the exact thread specification of the bicycle rear axle.
2. Select the matching axle extender variation.
3. Remove the original axle nut and related hardware.
4. Thread the extender onto the axle by hand until fully and evenly seated.
5. Install the compatible training wheel or stabilizer bracket.
6. Install the paired self-locking washer in the correct stacked orientation.
7. Reinstall the compatible axle nut and tighten securely.

Important Compatibility Notice:

Never force an extender onto the bicycle axle. A correctly matched extender should turn smoothly by hand. If the extender binds, tilts or stops after only a few turns, discontinue installation and recheck the thread specification.

This product is intended for compatible solid rear axles. It is not suitable for quick-release axles, thru-axle systems or any axle with a different diameter or thread pitch. Installation should be completed or inspected by an adult familiar with bicycle hardware. Check the installation before every ride and retighten the hardware immediately if movement or loosening is detected.