Mountain Bikes
Standard Trek MTB Sizing
This covers the main sizing structure used across much of Trek’s MTB range.
2XS – Rider Height: 53"–57" | Inside Leg: 25"–27"
XS – Rider Height: 57"–61" | Inside Leg: 27"–29"
S – Rider Height: 61"–65" | Inside Leg: 29"–31"
M – Rider Height: 65"–70" | Inside Leg: 31"–33"
ML – Rider Height: 68"–71" | Inside Leg: 32"–34"
L – Rider Height: 70"–74" | Inside Leg: 33"–35"
XL – Rider Height: 74"–77" | Inside Leg: 35"–36"
2XL – Rider Height: 77"–80" | Inside Leg: 36"–38"
Models using this general sizing:
Marlin Gen 3
Procaliber
Supercaliber Gen 2
Top Fuel Gen 3
Slash
*Not every model is offered in every size.
Fuel Gen 7
Covers Fuel EX Gen 7, Fuel MX Gen 7 and Fuel LX Gen 7.
S – Rider Height: 61"–65" | Inside Leg: 29"–31"
M – Rider Height: 65"–70" | Inside Leg: 31"–33"
L – Rider Height: 70"–74" | Inside Leg: 33"–35"
XL – Rider Height: 74"–77" | Inside Leg: 35"–36"
2XL – Rider Height: 77"–80" | Inside Leg: 36"–38"
*Important: Fuel Gen 7 drops the traditional ML size.
Session
Session uses Trek’s R sizing rather than normal S/M/L sizing.
R1 – Rider Height: 63"–69" | Inside Leg: 30"–32"
R2 – Rider Height: 69"–74" | Inside Leg: 32"–35"
R3 – Rider Height: 73"–77" | Inside Leg: 34"–36"