Despite its compact size

And with the Type-3 roller bearing clutch

2 x Nylock nuts

For a full compatibility list see below

Also compatible with 11/8-speed internal geared hubs

Lazer Gekko Kids Helmet - Youth - One Size Fits Most - Blue - Yellow Heavy/Bulky Despite its compact sizeGekko, the next generation of kids helmets from Lazer! Drop down side and rear protection keeps little ones safe as they explore the world by bike. A stylish integrated visor looks great and keeps the sun out of the eyes and off the face. The Lazer Autofit Retention System automatically adjusts to the riders head making the helmet quick and easy to fit, just put it on the head and let the Autofit work its magic. Plenty of vents ensure the helmet