FITTOO ball retainers are workable for most bikes, including mountain bike, road bike, hybrid bike, children bike, electric bike etc.
FITTOO bike ball bearing has most required sizes available, which cover the common bikes. Please find each size’s diameters posted in the link, and make sure to pick a correct size for your bike repairing purpose.
A good ball bearing is very essential for your biking! It makes your bike rolling smoothly! Including bottom bracket (middle axle for crank set), front wheel (front axle), rear wheel (rear axle), head parts (handle bar steering), good ball retainers are the heart of these big parts for a bike! Just spending a few dollars but making more happy riding, that is FITTOO ball bearings job!
It is much more convenient to install a ball retainer, which already keep the required balls on the retainer frame, when you replace some broken balls in your bike parts. You will have no stress to keep all required loose balls without falling out or lost when you are struggling to fix a small item in your bike.
Warm tips:
1. You may apply some grease before installation.
2. The sizes posted will have 0.1-0.2mm more or less tolerance.
3. Please take a few minutes to find out the old one in your bike, or ask some skilled mechanic, or contact FITTOO to help you out.









