Shimano uses their Rhythm Step Gear Progression which gives you the best possible gear combo and ratio

Collet 17 - 20MM

Unfortunately Gen 1 parts are no longer available from E-Thirteen

You'll never have to adjust these bearings

Dimensions L 55

Lazer MAX+ Kids Helmet - Youth - One Size Fits Most - Shark PDP|Colour Shimano uses their Rhythm StepThe Lazer Max+ helmet is a classic helmet and is now even better with its updated fitment system and awesome new designs. These are a top quality in mold kids helmet that offers fantastic protection for little shredders as well as enough adjustment to suit them for a few years. Well ventilated and lightweight this helmet can be worn by a toddler without fuss. Features: TS+ Turnfit System In Mold construction 11 vents Weight 295g Kids unisize (49 56