bike size chart
Starting sizes restated from Trek's published charts for the models we have sourced. Other Trek families have their own charts.
Short answer: Trek does not use one size chart for every bike. A Marlin mountain bike, a Domane road bike and a kids' Precaliber each have their own published ranges. The tables below restate those charts. Always check the size chart on the exact Trek model's page, and take a test ride if you can. We are not affiliated with Trek.
Marlin size chart (Gen 3)
Restated from Trek's Marlin Gen 3 sizing table as published by Trek dealers.[1 2nd-hand · Oct 22, 2026] Trek's mountain bike buyer's guide is the official overview of how Trek talks about mountain sizing.[2 · Oct 22, 2026]
| Size | Rider height | Inseam |
|---|---|---|
| XS | 4'9"–5'1" (145–155 cm) | 27–29 in (69–73 cm) |
| S | 5'1"–5'5" (155–165 cm) | 29–31 in (74–78 cm) |
| M | 5'5"–5'10" (165–177 cm) | 31–33 in (79–83 cm) |
| ML | 5'8"–5'11" (173–180 cm) | 32–34 in (81–86 cm) |
| L | 5'10"–6'2" (177–188 cm) | 33–35 in (84–89 cm) |
| XL | 6'2"–6'5" (188–195 cm) | 35–36 in (89–91 cm) |
| XXL | 6'5"–6'8" (195–203 cm) | 36–38 in (91–97 cm) |
The side-by-side lookup with another brand is on the mountain bike size chart.
Domane Gen 4 size by height
Restated from Trek's Domane SLR 7 AXS Gen 4 sizing table.[3 · Oct 21, 2026] This is that model's chart, not a chart for every Trek road bike.
| Rider height | Domane Gen 4 size |
|---|---|
| 150 cm (4'11") | outside chart |
| 155 cm (5'1") | 47 |
| 160 cm (5'3") | 50 |
| 165 cm (5'5") | 52 |
| 170 cm (5'7") | 54 |
| 175 cm (5'9") | 56 |
| 180 cm (5'11") | 56 or 58 |
| 185 cm (6'1") | 58 or 60 |
| 190 cm (6'3") | 60 or 62 |
| 195 cm (6'5") | 62 |
Compared with a general road guide and another brand on the road bike size chart.
kids bike size chart
Restated from Trek's kids bike buyer's guide by age and size.[4 · Oct 29, 2026] Age is only a rough guide: go by the child's height and inseam.
| Wheel | Height | Inseam | Typical age on 's chart |
|---|---|---|---|
| 12 in | 3'0"–3'3" | 15–18 in | 2–3 |
| 16 in | 3'5"–4'0" | 16–22 in | 4–6 |
| 20 in | 3'9"–4'6" | 19–25 in | 5–8 |
| 24 in | 4'1"–4'11" | 23–28 in | 8–11 |
| 26 in | 4'8"+ | 25 in+ | 10–12 |
Trek does not list a 14 in or 18 in range on that chart. Side-by-side with other kids' charts: kids bike size chart.
hybrid examples we have sourced
We have not restated a full FX or Verve size run here because we only opened the size ranges for the small frames on those models. On those charts, size S is listed for riders 155–165 cm (5'1"–5'5"). That is the size that lands on 5'4". Details are on best hybrid bike for 5'4". For other heights, use the size chart on the exact Trek hybrid model's page.
size chart FAQs
Does one size chart cover every model?
No. Trek publishes sizing by family and model. A medium Marlin is not a promise about a Domane, a kids' bike, or a hybrid. Use the chart for the exact model.
Why are some of these sources marked second-hand?
The Marlin Gen 3 height and inseam table is Trek's chart as published by Trek dealers, which we opened and restated. Trek's own mountain buyer's guide is linked alongside it.
Sources: 1. Trek's Marlin Gen 3 sizing table as published by Trek dealers: The Wheel House and Bicycle Barn (second-hand). 2. Trek, What size mountain bike do I need?. 3. Trek, Domane SLR 7 AXS Gen 4 sizing table. 4. Trek, Kids bike buyer's guide by age and size. Marlin and mountain sources checked Oct 22, 2026; Domane checked Oct 21, 2026; kids checked Oct 29, 2026. Trademarks belong to their owners; charts are restated in our own tables, not reproduced. We are not affiliated with Trek.