GT Bike Size Guide
GT Bike Size Guide
Find the right GT bike size for your height. GT offers mountain bikes, road bikes, BMX, and kids' bikes, each with their own sizing system. Use the charts below to find your perfect fit.
Mountain & Road Bike Size Chart
| Frame Size | Rider Height (ft/in) | Rider Height (cm) |
|---|---|---|
| XS / 44 | 4'8" - 5'0" | 142 - 152 |
| S / 48 | 5'0" - 5'5" | 152 - 165 |
| M / 51 | 5'5" - 5'10" | 165 - 178 |
| L / 55 | 5'10" - 6'1" | 178 - 185 |
| XL / 58 | 6'1" - 6'6" | 185 - 198 |
BMX Size Chart (Freestyle, Big Wheel, Kids)
BMX sizing is based on wheel size matched to rider height.
| Wheel Size | Min Height (ft/in) | Min Height (cm) | Max Height (ft/in) | Max Height (cm) |
|---|---|---|---|---|
| 12" | 2'10" | 85 | 3'7" | 110 |
| 14" | 3'1" | 94 | 3'7" | 110 |
| 16" | 3'7" | 110 | 4'0" | 122 |
| 18" | 4'0" | 122 | 4'10" | 147 |
| 20" | 4'10" | 147 | 6'0"+ | 183+ |
| 24" | 4'10" | 147 | 6'0"+ | 183+ |
| 26" | 4'10" | 147 | 6'0"+ | 183+ |
| 29" | 4'10" | 147 | 6'0"+ | 183+ |
BMX Race Size Chart
BMX race bikes are sized by model name rather than wheel size, with each model designed for a specific height range.
| Model Size | Min Height (ft/in) | Min Height (cm) | Max Height (ft/in) | Max Height (cm) |
|---|---|---|---|---|
| Micro | — | — | 4'0" | 122 |
| Mini | 4'0" | 122 | 4'4" | 132 |
| Junior | 4'3" | 129 | 4'7" | 140 |
| Expert | 4'6" | 137 | 5'5" | 165 |
| Expert XL | 5'1" | 157 | 5'6" | 168 |
| Pro | 5'4" | 162 | 5'8" | 173 |
| Pro XL | 5'7" | 173 | 6'0" | 183 |
| Pro XXL | 6'0" | 183 | 6'0"+ | 183+ |
| Pro XXXL | 6'0" | 183 | 6'0"+ | 183+ |
| Pro XL 24" | 5'6" | 168 | 6'0"+ | 183+ |
Between Two Sizes?
- Size down for a more aggressive, responsive ride
- Size up for comfort and stability on longer rides
- For BMX, riders who prefer more room for tricks may want the larger wheel/frame option
Shop GT Bikes
Browse our full range of GT mountain bikes and BMX bikes.
Need sizing advice? Contact us with your height and the model you're looking at.