Modern XC bikes have become considerably longer, and the Specialized Epic is a good example. That matters when choosing a bike box because the old assumption that an XC bike will automatically fit the smaller MTB option no longer holds true.
The Buxumbox Stelvio is the right box for the Specialized Epic, but whether you need the Standard or Long Wheelbase version depends on the generation and frame size.
Which bike box size does the Specialized Epic need?
The deciding measurement is wheelbase. The Stelvio Standard accommodates bikes from 1028 to 1209 mm, while the Stelvio Long Wheelbase takes bikes from 1210 to 1410 mm. Specialized’s current Epic 9 geometry is:
- Small: 1148 mm, Standard Stelvio
- Medium: 1184 mm, Standard Stelvio
- Large: 1223 mm, Long Wheelbase Stelvio
- XL: 1264 mm, Long Wheelbase Stelvio
So although the Epic 9 is firmly an XC race bike, half of the current size range is already too long for the Standard Stelvio. Specialized describes the Epic 9 as a 120 mm-travel XC race bike, but its progressive geometry gives the larger frame sizes wheelbases more commonly associated with much more aggressive mountain bikes a few years ago.
This is why we always recommend measuring the bike rather than choosing a Stelvio purely from its intended riding discipline.
What about the Epic 8?
The same point applies to the previous Epic 8. Its published wheelbases are 1147 mm, 1179 mm, 1210 mm and 1243 mm across the S, M, L and XL sizes respectively. That puts the Small and Medium into a Standard Stelvio, but the Large is exactly 1210 mm, making it a Long Wheelbase model according to the Stelvio sizing limits. The XL also requires the Long Wheelbase box.
It is a useful example of why a few millimetres matter. A Large Epic 8 should not be squeezed into a Standard box simply because it is an XC bike.
And the Epic World Cup?
The Epic World Cup is shorter than the full-suspension Epic 8 and Epic 9 across most of its size range.
Specialized publishes wheelbases of 1124 mm for Small, 1150 mm for Medium, 1181 mm for Large and 1212 mm for XL. That means the first three sizes use the Standard Stelvio, while the XL crosses into Long Wheelbase territory.
Again, frame size matters as much as the model name.
Packing a Specialized Epic into the Stelvio
The Stelvio was designed specifically around modern mountain-bike geometry. The Epic is secured inside the box through its front and rear axles, with the seat post, wheels and handlebars removed for travel.
On the current Epic 9, Specialized uses a 15 x 110 mm Boost front axle and 12 x 148 mm rear axle, both standard MTB sizes accommodated by the appropriate Stelvio mounting brackets. The Epic 9 also uses a 120 mm fork, so it is below the long-travel 170 mm-plus territory where some bikes may need their fork compressed slightly to reduce overall height.
If your Epic has a dropper post, it can often remain installed and simply be lowered to its shortest position. If the saddle still sits too high once lowered, the post can instead be removed from the frame and secured alongside the bike.
You should also check the Stelvio’s B1 and B2 cockpit-to-axle measurements before ordering. Both have a maximum of 770 mm.
Standard or Long Wheelbase?
For the latest Specialized Epic models, there is no single answer. A Small or Medium Epic 9 uses the Stelvio Standard, while a Large or XL needs the Stelvio Long Wheelbase. The Epic 8 follows the same split, while only the XL Epic World Cup requires the longer box.
That is perhaps slightly counter-intuitive for an XC race bike, but it reflects how much modern cross-country geometry has changed. Check the wheelbase first, then confirm the remaining measurements against the Stelvio sizing guide, and choose the box around the actual bike rather than the category it belongs to.
Specialized Epic images courtesy of Francois Schippers.