How to fit training wheels with gears
If you have an adult or older child who wants to learn to ride, they may be trying to do so on a bike fitted with gears. To use training wheels in this case, you will first need to purchase training wheels designed specifically for bicycles with gears. Commonly known as ‘adult training wheels’, these will suit bikes with derailleur gears and wheel sizes from 20 to 26 inches.
Prepare the bicycle
Shift the gears to the smallest chainring and the smallest rear cog. This will help ensure that the chain is under the least tension and make it easier to mount the training wheels.
Install the rear training wheels
Most training wheel sets come with a bracket that attaches to the rear axle. Remove the nut or quick-release skewer from the rear axle, slide the bracket onto the axle, and secure it tightly in place. Make sure the bracket is straight and level.
Adjust the training wheel height
Most training wheels have an adjustable height feature. You'll want to set them at a height where they're just off the ground when the bicycle is upright but make contact with the ground when the bike leans to one side. Use the adjustment mechanism on the training wheels to achieve the desired height and tighten it securely.
Double-check the installation
Ensure that all bolts and nuts are tightened properly. Give the bike a shake and test the training wheels to make sure they're stable and properly aligned.
Test the bike
Find a flat, open area to test the bike with the training wheels attached. Practice riding with the training wheels to get a feel for how they affect the bike's stability and handling.
It's worth noting that training wheels are typically used for younger children who are just learning to ride and are transitioning from a balance bike. As the rider becomes more comfortable and proficient, it's advisable to remove the training wheels and encourage them to learn to ride without them.