Surly Krampus Front Suspension Bike - 29" Steel Nose Drip Curry MediumSurly Krampus Front Suspension Bike 29" Steel Nose Drip Curry Medium. The bike that started it all the plus size movement that is. The Krampus Front Sus takes it a step further with the addition of front suspension and a dropper post providing more traction more control more fun. And as youd expect the frame features Surlys Gnot Boost rear hub spacing of 145mm; compatible with Boost 148 x 12mm thru axle 142 x 12mm thru axle and 135mm quick release