Durable all purpose truck for any type of skateboarding.55mm tall for optimal performance and wheel clearance with wheels 56mm and under.A356 T6 Aluminum Hanger & BaseplateThe best lightweight aluminum alloy heat treated to T6 condition for strength, durability, and grind feel.SCM435 Chromoly Steel AxleHighest quality and durability available.Grade 8 KingpinNever break, never bend.159 and 169 models feature 6 hole universal baseplate with old and new school mounting pattern.Independent Trucks are Built to Grind and Guaranteed for Life. ***TRUCKS ARE SOLD INDIVIDUALLY. IF YOU SELECT A QUANTITY OF ONE, YOU WILL RECEIVE ONE TRUCK. DO YOU NEED A SET? PLEASE SELECT 2. DETAILSWHAT SIZE TRUCKS DO I NEED FOR MY BOARD?WIDTH: 169HEIGHT: 55.0 mmAXLE129 - 7.60 in139 - 8.00 in144 - 8.25 in149 - 8.50 in159 - 8.75 in169 - 9.125 inHANGER129 - 127 mm139 - 137 mm144 - 144 mm149 - 149 mm159 - 156 mm169 - 166 mmWEIGHT129 - 367139 - 376144 - 387149 - 394159 - 402169 - 411