Frame sizes: The ultimate guide
Feb 24, · Bike Size Chart – Learn How To Choose Your Bicycle Frame Method 1) The Step-Over Test. You can try something known as a step-over test to see the fit of the bike in relation to Method 2) Measure Your Inseam. So, what is the inseam? The inseam refers to . Jul 27, · Method Two: Calculating the bike size: Take off your shoes and stand with your legs about cm(6” – 8”) apart. Measure the height from the ground to your Be sure of the type of bicycle you want: Mountain bike, city bike or road bike. You .
Read on to find out how to size up your road bike or mountain bike frame. Most bikes, whether road or mountain, are now measured in metric units, but you may find some manufacturers that still size mountain bikes in inches. Some brands, such as Moots, even mix the two!
We highly recommend you stick to metric units to keep things consistent. If you really must, you can always divide centimetres by 2. If you look at a what is the purpose of a computer case geometry table, it will usually include the real top-tube length.
But for a consistent measure, regardless of the top tube angle, you need to measure the horizontal top tube length, called the effective top tube length or virtual top tube in many geo charts. Measuring it correctly will mean using your spirit level or the clinometer app, to ensure that your measure is really how to choose frame size for bike. Many manufacturers skze road bikes by top tube length.
A 50s Colnago is equivalent to a 54cm top tube. Seat tube length is the straight line distance between the centre of the bottom bracket and the top of the seat tube. For more consistency, most manufacturers will now show reach and stack values for their bikes. These have the advantage of being independent of frame design and measure the perpendicular distances between two key contact points: the bottom bracket and the top of the head tube.
In brief, the reach is the horizontal distance between the two. Attach a plumb line to the end of the level. Align the top edge of the level with the centreline of the top of the head tube. Then move the level back and forward until the plumb line intersects with the centre of the bottom bracket spindle.
Another option is to push your bike up against a wall, measure the distance to the top of the head tube and the distance to the bottom bracket, then subtract one from the other. The stack is the vertical distance between the bottom bracket and the top sise the head tube. An alternative method is to measure the vertical distance from the ground to the top of your head tube, then measure the height of your bottom bracket from the ground and subtract this.
How to look like a guidette will hoow be increased if you measure the wheelbase on both bioe of the bike and take the average because this will compensate if the fork is not quite straight.
A frame with shorter chainstays will typically feel more lively how to choose frame size for bike how to hack colony on armor games where the stays are longer. The other component of the wheelbase is the front centre. Again, it affects handling, as well as toe overlap with the front wheel.
Note that the wheelbase is not the sum of the chainstay length and the front centre, as neither of these is measured horizontally. The seat tube and head tube angles are two of the most important factors to determining handling, with more upright tube angles typically leading to more nimble handling. Your clinometer app will come in useful here.
Make sure your bike is vertical and standing on a horizontal surface for an accurate reading. Most newer bikes will have tapered head tubes, so the angle of the front of the head tube will not be the same as the angle of its centreline. You can get close to the latter by holding your phone at the angle of the centreline, or by using a straight edge to line up with the centres of the top and bottom of the head tube. If you have straight fork legs, without an angle at their crown, chhoose angle of the legs will be the same as the head tube angle, so you can measure this instead.
You can also measure head tube angle by lining up the clinometer with the steerer extension above the ibke tube. The bottom bracket drop sie the difference between the height of the wheel axles and the centreline of the crank axle. You can measure it by finding the height of the rear axle and the height of the bottom bracket, then subtracting one from the other.
Finally, the bottom bracket height is the distance from the ground to the centre of the bottom bracket shell. Unlike bottom bracket drop, it will be affected slightly by your tyres too, so inflate them to your usual running pressure. Paul has been riding since he was a teenager and has been writing about bike tech for almost five years. He was into gravel fir it was even invented, riding a cyclocross bike across the South Downs and along muddy paths through the Chilterns. He dabbled in cross-country mountain biking too, before returning to drop bar bikes.
Home Advice Buying Guides How to measure a bike frame: our complete guide to sizing a bike. More bike buying advice Best bike: what type of bike should you buy? How to buy a used bike online. Top tube measurement. Seat tube measurement. Stack and reach measurements. Wheelbase measurement. Chainstay length measurement. Front centre measurement. Seat and head tube angles. Bottom bracket drop. Bottom bracket height measurement. Paul Norman. Daily Deals. Whyte G RS 29 V1 review. Inner tube buying guide: common sizes, materials, valve types and more.
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Key numbers that define your bike
2) Second step is choosing the right bike size. 3) The last thing then is adjusting ("fitting") the bike to your specific needs. Choosing the right size is important, but it's not THAT much of a big deal because you can do a huge difference with the final "bike fitting" adjustments. Want more detailed information? Jul 14, · If you really must, you can always divide centimetres by to switch to inches. You will usually be able to find a geometry chart for all sizes of a current frameset on a maker’s site.
But even if you are say cm tall, your legs can be anywhere between 0 cm and cm. Ok, cm legs and then head would be pretty weird….
That of course brings variety in sizing. In other words, it depends HOW you use your bike and how you want to feel when doing that , too. Need one thing to remember? Only very rarely the appropriate size of bikes is given by wheel size.
Namely, kids bikes are classified like that. Because then you are comparing comparable lengths. Whereas on road bikes the ratio and frame shape will be different to ensure you are in aerodynamic position when riding the bike. This is how it works:. Not sure how to do that? Check our guideline!
Choosing the right size is important, but it's not THAT much of a big deal because you can do a huge difference with the final "bike fitting" adjustments. Want more detailed information? See the box at the bottom of this articled for advanced info. Check out the kids sizes. Same bikes, but cheaper! Falling in between sizes? Before getting into the details here, a major disclaimer : there is a whole "science" of bike geometry related to bike fitting, as already mentioned above that can throw you off easily.
Buying your first bike? Take it all with a pinch of salt including this article and table below! That could take a couple tries, no way around this. Once you start actually using it, you'll learn what actually works and what doesn't for you personally. Looking to make things harder for yourself right from the beginning or just want a sneak peek into what lies ahead? Check this video about bike geometry.
There's a couple of special bike types which have their sizes set in a different way: most notably kids bikes, folding bikes and BMX. Aside from those, there's a plenty of other bike types with a similar issue, but we'll devote a separate article to those peculiar read: really REALLY interesting bikes. Kids bikes are as the only bike type classified by wheel size. It is because the frames are so small that different wheel sizes simply make bigger size steps than the frames.
And while folding bikes DO come in different wheel sizes 16, 20, 24, 26 and In other words:. BMXs size is measured differently — it is the top tube size.
Top tube is the top part of the frame that connects the head tube front of the bike with the seat tube. Typically, 16 inch wheels go for kids BMXs, 18 inch wheels are for small freestyle bikes, 20 is the standard for most BMX bikes and 24 is usually only for cruiser bikes. Aside from a general fit, you should also consider what you want to use the bike for. Just like with other bikes, the smaller the size, the more agile you will be, but the less stability will the bike provide.
This is how it translates to a specific use of your BMX:. Park riders typically prefer more responsive bikes. So shorter top tube, chain stay and a steeper head tube angle.
Pick slightly smaller size from our table above. So, a longer top tube, chain stay and a slacker head tube angle. This should give your ride more stability and comfort even on large jumps. Street riders typically pick something in between, depending on their personal preference. Street BMXs are typically a bit sturdier to endure grinding and flat landings. Frankly, choosing your size is the easy part.
This article will tell you more about how to do that. That means adjusting all its movable parts and eventually replacing those that are easily replaced so that the bike fits you like a glove. Contact points are places where you rider come in contact with the bike. Depending on a bike type, your preferred riding style position and your body constitution, you need a bike with different distances and angles between the contact points. This is a good illustration of how the principle works:.
This is a cool video showing a bike set up by a professional with some cool tips on the side :. Then you can use different equipment based on your setup — for instance, different seat types shape, hardness or handlebar types fit different riding styles. How to choose and check a second-hand bike.
Bike locks: How do I choose the right one?! The ultimate guide. Anti-theft 1. Marketplace with legal bikes only. Buy a bike Sell a bike What is BikeFair? Sign in. Frame sizes: The ultimate guide What size of bike is right for me? And while wheel sizes differ, they do not set ideal user height. Most visited Bikes in Amsterdam Buying a bike on Bikefair How to choose a second hand bike How to choose the right lock How to lock your bike properly.