Alpinestars Boot Sizing Guide: Find Your Perfect Fit

Key Takeaways

• Alpinestars EU sizing doesn't convert with a simple formula: the Tech 3, Tech 7, and Tech 10 use different lasts, so the same EU 41 fits differently depending on which line you buy.
• The Tech 10's inner bootie is the reason it runs snug. Riders comparing it to a Tech 7 in the same nominal size often need to size up half a size in the Tech 10 to match the same comfortable fit.
• Sock thickness moves your size more than most riders expect: a thick moto sock alone can push you a half size up from a barefoot measurement, which is why measuring in your actual riding socks matters.
• MXTire's confirmed chart covers EU 38 to 41. If your foot measures larger, check the exact sizes shown in stock on the product page rather than guessing at the extended range.

Buying Alpinestars boots online means trusting a size chart instead of trying them on, and getting it wrong means either a boot that pinches through a moto or one that lets your foot shift on landings. Alpinestars sizing runs a little differently across the Tech 3, Tech 7 and Tech 10 lines, and the EU size stamped on the boot doesn't always match what you'd guess from a US shoe size. Here's how to read the Alpinestars boot size chart and land on the right size the first time.

Do Alpinestars boots run big or small?

Alpinestars boots run true to the EU size stamped on the boot for most riders, with one exception: the Tech 10 fits snugger than its nominal size because of its inner bootie. The Tech 3 and Tech 7 hold closer to a standard fit.

Sizing is stamped in European numbering on the tongue or sole, with the closest US equivalent listed on each MXTire product page. Boot sizing isn't built the same way as a running shoe: it accounts for a shifted toe box, a buckle closure, and, in the Tech 10's case, an inner bootie layer. That's why the same EU number can feel different depending on which chassis it's built around. Treat the chart below as a starting point, then read the model notes before you buy.

Alpinestars boot size chart (US to EU)

The confirmed conversions below come from Alpinestars sizing data published by retailer RevZilla. Alpinestars publishes a full chart running well past these sizes on its own site, so if your size falls outside this range, check the official Alpinestars size chart or the exact sizes shown as in stock on each MXTire product page before ordering.

Does the Tech 10 fit different than the Tech 7?

Yes. The Tech 10 fits snugger than the Tech 7 because of its inner bootie, an extra layer between your foot and the outer shell that some riders size up half a size to fit comfortably. The Tech 3 and Tech 7 share a similar last and fit closer to true size.

If you already know your EU size, the Tech 3 is the safest one to order straight off the chart. The Tech 7 uses a similar last but adds a stiffer ankle collar, so try it on with the same sock thickness you'd ride in. As motocross gear tester Keefer Inc. has noted when comparing the two boots, that inner bootie is the biggest structural difference between the Tech 7 and the Tech 10.

How to measure your foot for a boot fit

1. Stand on a piece of paper and trace the outline of your foot, keeping the pen straight up and down against your skin.
2. Measure the longest point from heel to toe in centimeters for both feet. Feet are rarely identical, so size for the larger measurement.
3. Measure at the end of the day if you can, since feet swell slightly with hours on them, which is closer to how your foot will feel mid-moto.
4. Compare that measurement against the EU chart above, then adjust using the Tech-line notes before you finalize a size.

Common sizing mistakes

The most common mistake is ordering a regular street shoe size instead of converting to the EU boot chart, since the two scales don't match up one to one. The second is ignoring sock thickness: a thick moto sock can push you a half size up from what you'd wear barefoot. The third is not accounting for foot swelling on long rides, which makes a boot that felt fine at the start of the day feel tight by the end. The fourth is guessing between two sizes and rounding down. When in doubt, especially on the Tech 10, round up.

Frequently asked questions

Is my boot size the same as my shoe size?

No. Motocross boots use European sizing built around a different last than a street shoe, so always convert using a boot-specific chart rather than assuming your regular shoe size carries over.

Do I size up or down for boots?

If you're between two sizes, size up, particularly in the Tech 10, where the inner bootie takes up a little extra internal volume.

Does Alpinestars run small?

Not across the board. Most Alpinestars boots run true to size, and the Tech 10 is the one line that runs snug because of its inner bootie. Size up in that model if you're between two sizes.

Getting your Alpinestars size right the first time means checking the EU conversion, then adjusting for which Tech line you're buying. Once you've settled on a size, browse the full Alpinestars boots lineup at MXTire, or see how the three lines stack up directly in our Tech 7 vs Tech 10 vs Tech 3 comparison.