Characteristic：Light weight and easy to assemble
Product Specifications: The Former 610MM ARC LENGTH, After 560MM ARC LENGTH
Applicable:Most Mountain Bike
Expansion seat is suitable for the front fork hole: 20MM-27MM seat tube
Seat Case for: 25MM-34MM seat tube
Note:This bicycle wings can not application to road bike and fixed Gear Bikes. Can application to most of the mountain bike.