Ensuring that your bike is properly fit to you is an important step in preparing for your first ride. Your Authorized Specialized Retailer will be able to provide a basic fit, ensuring that you are able to ride comfortably and efficiently.  Specialized also offers Retül Fit, a data-driven bicycle fitting tool designed to improve comfort, prevent injury, and increase performance.

Fuse Expert 29 and Comp 29: Retül can help you estimate your bike size and saddle height here

Fuse 27.5: Retül can help you estimate your bike size and saddle height here

Fuse Sizing Chart (all models)

Height (in)Height (cm)Bike size
4'10" – 5'1"148 – 155XS
5'2" – 5'5"158 – 165S
5'5" – 5'10"165 – 178M
5'10" – 6'1"178 – 185L
6'1" – 6'4"185 – 193XL

Tire Pressure & Tubeless conversion

Running the correct tire pressure is crucial for a controlled and enjoyable ride. What you see below is a recommendation of a starting point or a "ballpark" tire pressure based on rider weight and tire size. Your preferred tire pressure may vary according to load, terrain, conditions, and ride style. Front tires can be inflated with less pressure than rear tires. You'll also see a decal on your wheels indicating maximum inflation pressure--never exceed the maximum inflation pressure of your tires or rims. Enjoy your ride! 

The Fuse Expert 29 and Comp 29 are equipped with 2.6" tires.

The Fuse 27.5 is equipped with 2.8" tires.

Generally speaking, lower tire pressures provide better control on wet or loose terrain, as well as a smoother ride. Higher tire pressures provide better puncture protection. Check your tires frequently to ensure your tire pressure is in the appropriate range.

Note that in the graph and table below, generally a higher rider + gear weight translates to a higher recommended tire pressure. These ratings apply to all wheel diameters. Use caution that you never exceed the rated maximum pressure for the tires or rims on your bike.

Mountain Tire Pressure Graph

Mountain Tire Pressure Data Table


Tubeless conversion

Many riders choose to convert to tubeless tires to prevent pinch flats. Tubeless tires allow riders to use lower inflation pressure without the risk of damaging a tube from impacts. Fuse Expert and Comp are tubeless ready. Fuse Base is tubeless compatible with proper rim tape added. For more information, see our Tubeless Conversion page.

Need more information on tire treads and casings? Visit our Mountain Tires page.