Skate Sizing

Choosing the correct skate size is a very important task and usually even more important than choosing the skates model! All high-quality skates will have a break in period and would 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.

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


Most of 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 the 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 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, 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 manufacturers 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.


Our sizing advice is targeted to a 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 to go 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...

Powerslide NEXT Core Black 100 Urban Inline Skates Size 38/39EU
USD$314.97 Select options

Powerslide NEXT Core Black 100 Urban Inline Skates Size 38/39EU


Make the city your playground with the NEXT Series. The Powerslide NEXT Core Black 100 with is minimalistic yet modern design can handle any urban adventure you throw at it. What’s more, it comes with TRINITY technology and allows you to switch between different frame setups.

Coming with as standard with 100mm Spinner wheels, Wicked ABEC 9 bearings, and the Elite casted frames. Large sizes from 46 up to 47 come with a larger frame fitting max. 110mm wheels. This setup offers it all, from especially comfortable to extremely sporty, the perfect skate for the urban jungle.

(2 customer reviews)

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Perfect for Powerblading, Urban, and Fitness

  • Shell: Polypropylene, Glass-fiber reinforced plastic (GFRP) – GFK
  • Closures: Upper Strap, Middle micro-adjustable ratchet buckle, laces
  • Liners: MYFIT Recall Liner, Heat moldable, Dual Fit
  • Frame: Powerslide Elite AL TRINITY Black
  • Frames Size: 231mm 3x100mm
  • Frame Mount: Trinity with Lower Center Of Gravity
  • Wheels:  Powerslide Spinner 100mm / 88A White (all sizes)
  • Bearings: Wicked ABEC9
  • Brake: not Included. Optional HABS brake
  • Weight: 1650g (size 42/43U)

Additional information

Weight4.5 kg

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Skating Style





Wheel Size (mm)

Boot Durability

Boots Comfort

Boots Control

Boots Fit

Setup Speed

Recommended Skill Level

Boot Ventilation


PS Next Sizing

Accordingly to Powerslide, the Next boots are fitting fairly true to the shoe size. So far, our impression is that they fit a bit on a smaller side.

Please note: that your shoe size is the defining factor! Almost never, the size of the inline skates will be smaller than your shoe size. If your foot is wider than average, please go one size up than your shoe size. As a general rule, Powerslide fits average in width.

If you want to use the foot length information to narrow the sizing down, the best way is to get that information from your running/sports shoes sizing label. Almost always they will have one of the following: MP/MONDO/CM – length in centimetres or MM – length in millimetres.

2 reviews for Powerslide NEXT Core Black 100 Urban Inline Skates Size 38/39EU

  1. vreyedoc (verified owner)

    This is my first pair of Powerslide skates. Initially, I was a bit skeptical about the fitting and comfort level of the Next boots, because there are some bad reviews on youtube. But these skates have many features that attract me, so when I saw there was one pair of 38-39 size back on stock, I pulled the trigger. Three days later I am very happy about my choice.
    – The boots are well designed and made of high-quality material. The shell is very stiff, and the recall liner is thick and rigid too, so it was difficult on the first day to put my feet in and out of the boots. There was also a pressure point on the medial side of my right ankle. But once broken in, the boots and liner provide excellent support and power transfer. The pressure point disappeared on day 3.

    -Trinity works! three-point fixation is more secure than 165mm mount, I feel that the three M6 frame screws are less likely to get lose than two M8 for 165 frame mount. Maintainance and frame adjustment is also easier because you only have to take out one back wheel to assess the screw.

    – Very happy about the wheel size and base length. (I am a short guy with EU39 feet) The cruising speed is as fast as my rollerbalde RB 110mm (255 mm base length) but much more maneuverable. I wouldn’t say it’s as zippy as my 231/76 mm 4-wheel rocker setup, but I can pull off all my slalom moves on this 231/100 triskate setup. I expect the maneuverability to further increase with natural rocker when the front and back wheels wear down a little bit.

    -The toe box of Next boot does fit wider than other powerslide skates. I tried PS EVO HC carbon boots before, a 40-size HC EVO was squeezing my bunion. but I am ok with the 39-size Next.

  2. andrewjstubblefield (verified owner)

    I’m adding this review with some hesitation due to mixed feelings. I’ve been skating these for about 3 weeks, between 2 and 4 times per week. I skate mostly at the local park and then will traverse a few blocks around there, mixing it up between asphalt and concrete.
    My first disappointment came when the cuff lever broke the first time I put them on. This was mostly my fault as I did not trim the guide first and I tightened it too much in one go. I was able to scavenge a buckle off of a pair of FRX skates.
    However, today I decided to experiment with the laces. I normally only lace up to where the cuff buckle overlaps, but decided to lace to the top to get a better fit around my ankle. The grommets snapped the corners of the boot off when I went to pull them tight; so suddenly I actually laughed. Welp, I guess seco d to last grommet it is. To be fair, these boots took some finicky adjusting to get them not to hurt. They came very tight around the front of my ankles and I had to heat and slightly flare that out to make them fit right. Maybe this affected the plastic, don’t really care.
    What stinks is that the Trinity mounting is a DREAM. These 3 wheel skates feel more stable and grounded than my 4X80 setup and they are still my favorite skate for that reason alone, even though my FR’s (FRX) are objectively more comfortable and I’ve thrashed them to death without breaking any parts. Not to mention they were $100 cheaper. If I could add 3/4 of another star I would, but IMO these are not 4 star worthy.

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