Will fit both 3/8 and 10mm axles.3/8 10mm axle extenders.
Stabiliser Bolt Axle Extension 1 Needed Childs Bike With Gears 3/8th axle 10mm
Stabiliser Axle Bolts Extender 10mm 3/8" child's bikes without gears By Adie
Stabiliser fitting kit: Adie 3/8" stabiliser extender bolts
Replacement Stabiliser Wheels Childs Bike Stabiliser Rubber Training Wheels
BIKE YOKE SQUEEZY COLLARLESS SEAT CLAMP 38 - 38.5 mm LIGHT WEIGHT 8g
FIFTY-FIFTY Bike Seat Post Clamp, Aluminum Alloy Bicycle Seatpost Collar, 28.6/29.8/31.8/34.9/36.4/38.6mm Bicycle Seat Tube Clip for Most MTB, Road Bikes (38.6mm, Black)
