Ask a new inline speed skater what makes a skate fast and most will point to the wheels or the bearings. Ask an experienced racer and they will usually start with the frame. The frame is the aluminium spine that bolts your boot to your wheels, and it quietly decides how your power reaches the road, how the skate turns, how planted it feels at pace and how much dead weight you lift with every single stride. Get the frame right and everything above it works better. Get it wrong and even the best wheels and bearings feel wasted.
This guide walks through everything a skater needs to know before buying an inline speed skating frame. We cover wheel size and how it changes the ride, the difference between three wheel and four wheel setups, platform length, the Hi Lo idea, mounting standards, and how to match a frame to your discipline, whether that is track racing, road marathons or all round fitness skating. Every frame mentioned here is from the LiveLica Aerolite range, machined from 7075 T6 aircraft grade aluminium, so the numbers quoted are real specifications you can trust rather than rough guesses.
Why the frame matters more than skaters think
A frame does three jobs at once. First, it transfers power. When you push, the force from your leg travels through the boot, into the frame and out through the wheels to the ground. A stiff frame passes almost all of that energy straight to the road. A frame that flexes or twists loses some of it, so you work harder for the same speed. Second, it sets your geometry. Wheel size and platform length change your ride height, your stability and how quickly the skate turns. Third, it adds or saves weight. Every gram sits at the end of your leg and gets lifted thousands of times in a session, so a light frame genuinely saves energy over a long distance.
This is why serious skaters treat the frame as a considered purchase rather than an afterthought. The good news is that the choice comes down to a handful of clear decisions, and once you understand them the right frame becomes obvious.
Wheel size, the first big decision
Wheel diameter is the single biggest factor in how a speed frame rides. Bigger wheels roll further with each rotation and hold their speed for longer, which is why distance and road skaters chase large sizes. Smaller wheels keep you lower to the ground, accelerate quickly and turn sharply, which is why track and technical skaters value them. The common speed sizes are 90mm, 100mm, 110mm and 125mm, and each one shifts the balance between agility and rollout.
Larger wheels roll further per stride, smaller wheels keep you low and quick to turn.
There is no single best size. A skater who wants outright pace on smooth roads leans towards 110mm or 125mm. A skater who races on a tight track or wants sharp handling leans towards 90mm or 100mm. Many committed skaters own more than one frame and swap depending on the session.
Three wheels or four wheels
The other big choice is how many wheels the frame carries. The classic speed setup is four wheels, and it endures because four points of contact give grip, stability and predictable handling when you load the skate hard into a corner or a start. A three wheel frame, often called a triskate, runs fewer, usually larger wheels. Fewer wheels mean less rolling resistance and less weight, and a triskate turns more willingly and feels more playful underfoot, while a big diameter keeps the top speed high.
So the rule of thumb is simple. Choose four wheels when you want stability, grip and a grounded, traditional race feel. Choose three wheels when you want the lightest, most agile platform that still rolls fast thanks to a big wheel. Neither is a compromise, they are two different flavours of speed.
Platform length and stability
Platform length is the distance between the front and rear axles, and it controls how the frame behaves. A long frame tracks dead straight and stays composed at race pace, which is exactly what you want when you settle into a sustained distance effort. A short frame turns more eagerly and feels lively, which suits technical skating and tight courses. The Aerolite range spans a wide spread of lengths, so you can pick the character you want.
The short three wheel Aerolite turns eagerly, while the long four by 110 stays rock steady at race pace.
The Hi Lo idea, explained simply
You may see frames described as Hi Lo. It simply means high at the back and low at the front. A Hi Lo frame mixes wheel sizes, keeping larger wheels at the rear and dropping to a smaller wheel at the front. The LiveLica Aerolite Hi Lo runs three 110mm wheels with a single 100mm wheel up front. That smaller front wheel sits you with a slight forward pitch, which puts your weight over the front of the skate, sharpens acceleration and makes the skate feel more agile through a turn, while the big rear wheels keep the top speed and rollout of a full size setup.
A smaller front wheel tips the boot forward, so a Hi Lo frame accelerates and turns more keenly than a flat one.
Mounting standards, get this right before you buy
A frame only fits a boot if the bolt spacing matches. The common inline speed standards are 150mm, 165mm and 195mm, measured between the front and rear mounting bolts. The shorter 90mm frames often use 150 or 165mm, mid size frames commonly use 165 or 195mm, and the longest four wheel road frames use 195mm. Most Aerolite frames are drilled for two standards at once, so they fit the widest range of boots and stay with you if you change boots later. Always check what your boots are drilled for before ordering, and if you are unsure, measure the bolt spacing or ask before you buy.
Weight and why 7075 T6 matters
Every Aerolite frame is cut from 7075 T6, an aircraft grade aluminium prized for its strength to weight ratio. That matters because a frame has to be light so you waste less energy lifting the skate, yet stiff so it does not twist under a hard push. Cheaper alloys force a choice between the two. A strong alloy like 7075 T6 lets the frame be both. It is why the short 90x3 Aerolite weighs only 114 grams, the classic 4x90 comes in at 124 grams, and even the long 4x110 race frame stays at 159 grams. Low numbers like these are felt most over long distances, where the saved weight adds up stride after stride.
Matching a frame to your skating
Here is how the Aerolite range lines up against real world skating, so you can go straight to the right frame.
- Track and short course. The Aerolite 4x90 keeps you low on four 90mm wheels for grip, control and quick direction changes on a banked track or a tight course.
- Do it all training and fitness. The Aerolite 4x100 balances rollout and control on four 100mm wheels, the sensible one frame choice if your sessions vary.
- Big wheel top speed. The Aerolite 3x125 runs three of the largest common wheels for maximum rollout on a light, agile triskate.
- Road and marathon racing. The Aerolite 4x110 is the long, planted four wheel race frame for sustained pace, while the Hi Lo option adds a forward pitch for a livelier distance feel.
If you want a short, nimble three wheel setup rather than a long race frame, the 90x3 Aerolite is worth a look too. You can compare every option side by side in the LiveLica AI Frames collection.
Finishing your setup
A frame is only part of the package. Each Aerolite comes with the Allen key, spacers and axles you need to mount it, and it takes standard 608 bearings, two per wheel. Choose your wheel diameter to match the frame, then pick a durometer and brand to suit your surface. Browse compatible wheels and speed bearings, and if you are new to wheel choice, read our guide on wheel size and durometer before you commit.
Frequently asked questions
How do I know which mounting my boots use?
Look at the bolt spacing under your boot. Inline speed boots are commonly drilled for 150, 165 or 195mm between the front and rear bolts. Many Aerolite frames fit two standards at once, but always confirm before ordering, and ask us if you are unsure.
Are bigger wheels always faster?
Not always. Bigger wheels roll further and hold top speed better, but they raise your ride height and slow acceleration and turning. On a tight track or for technical skating, smaller wheels can be quicker overall because they handle better. Match the wheel size to your discipline rather than simply going as big as possible.
Do I need one frame or a pair?
You need one frame per skate, so a full setup uses two. Always check the pack details on the product page before ordering, and message us if you need a matched pair.
What is the difference between a triskate and a four wheel frame?
A triskate runs three, usually larger wheels for less weight, less rolling resistance and quicker turning. A four wheel frame gives more grip and stability with four points of contact. Pick a triskate for a light, agile big wheel ride and a four wheel frame for a planted, grounded race feel.
Will a lighter frame really make me faster?
It helps, especially over distance. A lighter frame saves energy on every stride because you lift less weight, and a stiff, light frame like the 7075 T6 Aerolite also wastes less of your push to flex. It will not replace fitness and technique, but it removes a handicap the best skaters do not carry.
