Serfas BMP-SP Saddle Steel Black Medium giant You may need to change

You may need to change the front gearing so the rear derailleurs capacity is not exceeded

Works with all Lazer Gekko and Lil Gekko kids helmets

also features ramped knobs to minimize rolling resistance

Mount compatible only with B1 SL Speed seatpost

Mechanical Disc Brake

Serfas BMP-SP Saddle Steel Black Medium giant You may need to change90 Day Comfort Guarantee We understand finding the perfect saddle can be tough, which is why every Serfas saddle sold is backed by our 90 Day Comfort and Satisfaction Guarantee Limited Lifetime Warranty Serfas stand behind their products and are committed to providing the high quality all of their customers deserve which is why Serfas warrants to the original purchaser of a saddle that the product is free from defects in materials and workmanship for