Official sizing guide for 2026
GT's iconic Triple Triangle frame design isn't just visual—it provides additional rear-end stiffness and compliance that influences how each size rides, giving their bikes a distinct feel under power. With roots in BMX and decades of gravity racing heritage, GT sizes their bikes to encourage an active, centered riding position that rewards riders who like to push their limits on varied terrain.
| Size | Height Range | Inseam Range |
|---|---|---|
| XS | 4'12" - 5'4"(152 - 162 cm) | 26.4" - 28.7"(67 - 73 cm) |
| S | 5'3" - 5'7"(160 - 170 cm) | 28.3" - 30.7"(72 - 78 cm) |
| M | 5'6" - 5'10"(168 - 178 cm) | 30.3" - 32.7"(77 - 83 cm) |
| L | 5'9" - 6'2"(176 - 188 cm) | 32.3" - 35.0"(82 - 89 cm) |
| XL | 6'1" - 6'6"(186 - 198 cm) | 34.6" - 37.4"(88 - 95 cm) |
| Size | Height Range | Inseam Range |
|---|---|---|
| XS | 5'1" - 5'5"(155 - 164 cm) | 27.2" - 29.5"(69 - 75 cm) |
| S | 5'4" - 5'8"(162 - 172 cm) | 29.1" - 31.1"(74 - 79 cm) |
| M | 5'7" - 5'11"(170 - 180 cm) | 30.7" - 33.1"(78 - 84 cm) |
| L | 5'10" - 6'2"(178 - 189 cm) | 32.7" - 35.0"(83 - 89 cm) |
| XL | 6'2" - 6'6"(187 - 198 cm) | 34.6" - 37.4"(88 - 95 cm) |
| Size | Height Range | Inseam Range |
|---|---|---|
| XS | 5'0" - 5'4"(153 - 163 cm) | 26.8" - 29.1"(68 - 74 cm) |
| S | 5'3" - 5'8"(161 - 172 cm) | 28.7" - 31.1"(73 - 79 cm) |
| M | 5'7" - 5'11"(170 - 181 cm) | 30.7" - 33.1"(78 - 84 cm) |
| L | 5'10" - 6'3"(179 - 190 cm) | 32.7" - 35.4"(83 - 90 cm) |
| XL | 6'2" - 6'7"(188 - 200 cm) | 35.0" - 37.8"(89 - 96 cm) |
Specific sizing recommendations for GT's most popular bike models. Geometry measurements shown for reference size (typically M or 54cm).
Trail bike with 130mm of rear travel and the Triple Triangle frame. Balanced geometry works well for all-around trail riding—the seatstay design adds compliance, so most riders fit comfortably at their recommended size.
Enduro bike with 160mm front and 150mm rear travel. Aggressive geometry with a slack 63.5-degree head angle—riders who split time between bike parks and natural trails should size based on reach for descending control.
Legendary XC hardtail with Triple Triangle heritage dating back to 1991. Modern geometry updates bring longer reach and slacker head angles while maintaining the efficient climbing DNA—size for your preferred reach to the bars.
Entry-level hardtail designed for riders new to mountain biking. Relaxed geometry and moderate reach make it forgiving for beginners—sizing is straightforward based on height, with no need to account for aggressive riding position.
Gravel bike featuring GT's Triple Triangle design adapted for drop-bar use. The unique seatstay junction adds vertical compliance for rough surfaces—riders transitioning from road bikes should note the slightly longer reach compared to typical endurance road geometry.
Use our free calculators to determine your ideal GT frame size based on your measurements.
Compare sizing across different bike manufacturers to find your perfect fit.