3T Ultra geometry
3T Ultra (carbon gravel) has 6 published frame sizes. Stack 520–632 mm; reach 351–399 mm. Sources, weights and tyre clearance where available.
Gravel · carbon · Model year not specified
Measurements
Lengths in mm · Angles in degrees Select + beneath a size to compare
| Frame size | 48 | 51 | 54 | 56 | 58 | 61 |
|---|---|---|---|---|---|---|
| Stack mm | 520 | 542 | 564 | 584 | 604 | 632 |
| Reach mm | 351 | 362 | 373 | 381 | 388 | 399 |
| Effective top tube mm | — | — | — | — | — | — |
| Seat tube length mm | 436 | 463 | 490 | 518 | 549 | 576 |
| Head tube length mm | 122 | 142 | 158 | 175 | 196 | 225 |
| Head tube angle ° | 68.5 | 69.5 | 71 | 72 | 72.5 | 72.5 |
| Seat tube angle ° | 74 | 74 | 74 | 74 | 74 | 74 |
| Chainstay length mm | 419 | 419 | 419 | 419 | 419 | 419 |
| Wheelbase mm | — | — | — | — | — | — |
| Bottom bracket drop mm | 79 | 79 | 77 | 77 | 75 | 75 |
| Bottom bracket height mm | — | — | — | — | — | — |
| Fork length mm | 375 | 375 | 375 | 375 | 375 | 375 |
| Fork offset mm | — | — | — | — | — | — |
| Trail mm | — | — | — | — | — | — |
| Standover height mm | — | — | — | — | — | — |
| Front centre mm | 597 | 606 | 602 | 607 | 616 | 636 |
— Not published in the collected chart. Size labels follow the manufacturer.
Frame and fork weight
- Frame: 1130 g · size 54
3T claimed first-generation Exploro Ultra painted frame with hardware, size 54.
- Fork: 450 g
3T claimed first-generation Exploro Ultra uncut fork; paint and hardware inclusion not stated.
Tyre clearance
- Up to 46 mm · 700C
Measured tyre width (WAM).
- Up to 61 mm · 650B
Manufacturer-published maximum for 650B tyres.
Sources
Reviewed 2026-10-01
Measurement and frame notes
- The source labels a top-tube length without specifying an effective/horizontal measurement, so effective top tube is left blank.
- Head tube length is the published “road” head tube value with a 375 mm fork; no gravel-fork adjustment has been applied.
- The Ultra figures describe the first-generation Exploro Ultra, not the Ultra² Italia.
- Weight source: https://contenderbicycles.com/blogs/blog/3t-exploro-ultra-gravel-bike