Add height to your Alpcour 4-tier riser blocks (sold separately) to enhance your bike training regimen using this Alpcour Bike Trainer 4-Tier Riser Block Extender. Made of rugged, premium-quality molded plastic that boosts stability, resists slippage and prevents scratching floors, it supports riders weighing up to 220.46 lbs. for long-lasting use. Alpcour Bike Trainer 4-Tier Riser Block Extender Black - Bicycle Accessoriesories at Academy Sports
