Skate Sizing

Choosing the correct skate size is a very important task and usually even more important than choosing the skate model! All high-quality skates will have a break-in period and will adjust over time to the skater’s feet. Some will take longer and some shorter, but while you want to have a comfortable ride you do not want to have the skates too loose… The correct fit will determine much more than just the comfort - it will define how much control, power transfer, and agility you would have while skating, and even would affect the balance.

Please remember that the skates will feel the worst when you try them for the first time and from there the fit will only improve!!!

While various skating styles and skaters themselves have different preferences, below are the general instructions on how to determine the perfect fit for your new skates.


Most inline and roller skates are manufactured and sold in European sizes (EU), so your US / UK sizing could be a wrong idea to use due to conversion inaccuracies. Furthermore, even if you know your European sizing, every shoe and skate manufacturer has a slightly different fit and sizing, therefore your standard shoe size might not assure a perfect fit but that is the best way to estimate your skate size. In any case, the inline and roller skate size should be either equal to your shoe size or no more than one size up or down from it.

Based on our experience, the best way to determine your skate size is to take a look at your current pair of skates and/or running shoe labels for MM / CM / MP / MONDO numbers. These numbers are indicating the maximum foot length that will fit into the pair, while MM shows the measurement in millimeters and CM/MP/MONDO is centimeters. Having these numbers along with the EU sizes from these shoes, you will be able to determine the size of the skates that you need by looking into the brand or model-specific sizing chart (usually located in the Sizing tab under the skates photos or as one of the product photos). If cannot be located, please send us an inquiry and we gladly will help you out!

Important: Many shops are recommending measuring your feet to determine your skate size, but we have found that this leads to too many mistakes and do not recommend that. If after following the instructions above you are finding yourself stuck in between two sizes, you could measure your feet according to the directions below. In this case, your shoe size is still the defining factor, so if the measurement is showing more than one size up or down, something is wrong with the measurement! If your foot is wider than average, please go one size up. Usually, Seba, FR, and Adapt skates fit wider than average, Powerslide and K2 average, Flying Eagle and Rollerblade average to narrow...

Still, want to measure your feet? Here is how to do it:

You’ll need paper, a pen, a flat wall, and, if possible, a buddy to help. It’s best to measure your feet later in the day after you have been on them for a few hours to account for swelling.
Find a hard floor with a flat wall. Tape a piece of paper down so that it touches the wall. Stand on the paper in bare feet, with your heel just touching the wall.
Have your friend take a book and place it so that it just touches the tip of your longest toe. Mark the spot where the book meets your toe. Do this with both feet and use the larger of the two measurements. Measure your foot length in millimeters, if possible. If you measure in inches, be sure to measure in 16ths of an inch.
Choose your size from the manufacturer's sizing chart. The “Max Foot Length” is the longest foot measurement that will fit into that size. The US Men’s column lists the sizes found on the box.

Here is a great sizing video courtesy of Powerslide:



Our sizing advice is targeted at freestyle or dance skater who wants a very snug fit in their skate to enjoy maximum control. Our instructions will give a fit that prioritizes control over comfort. If comfort is a higher priority, or if you have an especially wide or oddly shaped foot, you may do well to choose a slightly larger size. If you are near the boundary between two sizes, you would probably be better off going with the larger size in case you prefer comfort over control.

Notes about Width
In general, the Plastic Boot skates with a built-in liner have a narrower fit through the foot, while the boots with a removable liner and soft boots have a somewhat wider fit. The Carbon is a bit wider through the toe box than the plastic boot skates because the carbon fiber boot has less flex. As a rule of thumb, skates with built-in liners and "regular" liners will have less adjustment room.

We gladly will guide you in case you have any further questions. Email us at [email protected]

To help you better, please include all the sizing information off one or two pairs of skates or running shoes that you currently have including EU/US/UK/MP/CM/MM/MONDO, etc...

GYRO Valkyrie 100mm 87A Wheels
GYRO Valkyrie 100mm 87A Wheels (2 Pack)
USD$18.00 USD$13.79 Add to cart

GYRO Valkyrie 100mm 87A Wheels (2 Pack)



GYRO Valkyrie 100mm 87A Wheels. If you want to have fun race-skating, you should select GYRO VALKYRIE wheels that guarantee both reasonable price and high quality (safe hub structure). Those high-end wheels were developed in the GYRO laboratory and tested by GYRO professional racing skaters.

This new version features a new improved Polyurethane formulation combining materials imported from the USA and Germany. It is popular and is still hot…

(3 customer reviews)

Only 2 left in stock

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Size Guide

Sold in Sets of 2

  • Size: 100mm
  • Hub: 66mm
  • Thickness: 24mm
  • Hardness: 87A
  • Bearing Core: 608 (Standard)
  • Spacer: 10.25±0.03mm
  • Color: Black
  • Recommended Surface: Asphalt

Additional information

Weight0.4 kg
Skating Style


Wheel Size (mm)

Wheel Durability



3 reviews for GYRO Valkyrie 100mm 87A Wheels (2 Pack)

  1. Tonedawg

    SPEED !

    Once you try the big wheels you’ll never go back. These suckers RIP! Plus, with my black boots, black frame and black wheels, I look quite “classy”. These wheels offer a nice combination of grip and speed.

  2. Calvin (verified owner)


    Coming from Rollerblade hydrogen wheels you can immediately tell these are HARD wheels. You can feel rough parts of the road a lot more and forget about skating on wet pavement. But the roll on these are incredible my average speed increased by 2+mph with these wheels they just roll and roll.
    They also grip very well as long as its dry out but you can also push them into a slide when you want to.
    The main reason I purchased these wheels was because they are black; with my red supersonic frames and black Twister boots they look pimp and won’t turn brown after you skate on them like white wheels do. I wish there were more black wheels in 110 and 125mm.
    Only downside is it was very hard to insert the bearings in them; had to use a hammer never had this problem before.

  3. Alberto (verified owner)

    The best wheels so far.aand a big plus to proskaters for recommending.

    So when i bought my FE phantom frame, i ask the guys at proskaters what wheels would they recommend and he sent a bunch of different one’s including matter, undercover and gyro. Man I can’t be more happier with these wheels, maybe I went a little to much on hardness 87a because you really have to dig in to get them to slide but these wheels are fast and hard. I work in bahamas on a private island and the roads are custom made with SHELLS in them. I rollerblade twice a day hard turns and a few t-stops and powerslides, and am still seeing the lines on these wheels. Gyro you have put a spell in me . If you want wheels that will last long, trust me. This is the way to go. Thanks proskaters very nice recommendations.

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