Reading KTM's sizes
KTM Bike Industries, the Austrian bike maker, labels its mountain frames with numbers rather than letters. The quick translation is 38 equals S, 43 equals M, 48 equals L and 53 equals XL. KTM's own printed height chart is, in its words, a rough indication only, so on a mountain bike the reliable approach is to size by reach and rider height together. One more thing worth knowing: fit character varies by model. The touring minded Chacana and the compact Lycan genuinely run short, while the newest platforms, the Kapoho and the light Scarp SX, are modern and roomy.
Browse the range: all KTM bikes at Bikeroom.
Please note. KTM states its height chart is only a rough guide, so treat the sizes here as a starting point and let reach do the real work. Riding style and reach preference shift the answer, and a fit or test ride confirms it.
Your KTM size by height
Find your height for the baseline numeric size, then use the model tables to check reach, since that is where KTM models differ most.
| Rider height | KTM size |
|---|---|
| 158 to 171 cm | 38 (S) |
| 168 to 180 cm | 43 (M) |
| 178 to 189 cm | 48 (L) |
| 186 to 199 cm | 53 (XL) |
The Macina e-MTBs mostly start at 43 (M), so shorter riders have fewer electric options. Because reach varies so much by model, always cross check the tables below.
How to choose your size
Take your height barefoot, then lean on reach, comparing the numbers with a bike you like, because KTM's height chart is deliberately approximate. If you want an XC race position, size toward the shorter reach; for trail stability, size up. The analog bikes carry over 2025 geometry, while the Macina e-MTB figures are the current official numbers.
Analog mountain bikes
The Scarp is the XC full suspension racer with a conservative, short reach, so taller riders often go up a size. The Scarp MT is the slightly longer, more relaxed downcountry version, and the Myroon the efficient XC hardtail.
| Reach (mm) | 38 (S) | 43 (M) | 48 (L) | 53 (XL) |
|---|---|---|---|---|
| Scarp | 423 | 440 | 458 | 475 |
| Scarp MT | 428 | 445 | 463 | 480 |
| Myroon | 425 | 443 | 460 | 477 |
On the XC Scarp, reviewers suggest riders over about 178 cm choose the 48 (L), since the 43 is short for modern XC.
Macina electric mountain bikes
The Macina Kapoho is the modern, roomy all mountain and enduro e-MTB that sizes up well. The Chacana is the comfort and touring e-MTB, upright and clearly short in reach, so consider sizing up for a sportier fit. The Scarp SX is the light e-MTB with the longest, sportiest reach in the KTM range. These come in 43, 48 and 53 only.
| Reach (mm) | 43 (M) | 48 (L) | 53 (XL) |
|---|---|---|---|
| Macina Kapoho | 453 | 471 | 493 |
| Macina Chacana | 410 | 435 | 460 |
| Macina Scarp SX | 456 | 472 | 499 |
The gap between the compact Chacana and the roomy Scarp SX is large at the same size, which is exactly why reach matters more than the number here.
What KTM riders find
KTM's old reputation for short reach is real but now model specific. It holds for the touring Chacana and the compact Lycan, and for the base XC Scarp, where reviewers advise taller riders to size up. It does not hold for the newest platforms: the 2026 Kapoho and the Scarp SX are genuinely modern and roomy, and finally shed that criticism. The enduro Prowler sits in the middle, moderate in reach but very slack, so it can feel compact for its travel. Because the spread is so wide, the single most useful habit with KTM is to ignore the number, note the reach, and compare it to a bike you already ride.
Between two sizes?
Size toward the shorter reach for a racy, nimble XC feel, or up for trail stability and room. On the short reach models like the Chacana, sizing up is often the better call, while the roomy Kapoho and Scarp SX rarely need it. Send us your height, inside leg and the reach of your current bike and we will match it.
Shop KTM
- All KTM bikes including the Scarp, Myroon and Macina e-MTBs
Numbers not adding up? Ask our concierge
KTM's numeric sizes and model to model reach differences make this a good one to check. Tell our concierge team your height, inside leg and riding style, and we will translate it into the right KTM size. Talk to our concierge.
These sizes are guidance, not a fitting guarantee. KTM's rider height chart is explicitly a rough indication, so reach is the primary metric here. Macina e-MTB reach is current official data; analog reach carries over from the 2025 model year and is expected unchanged but worth confirming on the exact bike you are buying.
