All of these can all be altered by either adjusting an existing component or swapping to a new one.Ī frame's stack and reach, though, can't be changed (although, admittedly, Argon 18 uses what it calls a 3D System on some of its bikes to allow you to adjust the height of the head tube) and they're very important in determining your ride position.
![crank arm length on 2018 stache 7 crank arm length on 2018 stache 7](https://ep1.pinkbike.org/p4pb16897376/p4pb16897376.jpg)
Of course, a lot of other factors influence your riding position: seatpost extension and layback, the position of the saddle on its clamp, the size and number of headset spacers you use, the length and angle of the stem, handlebar width, reach and drop. A 54cm Cannondale SystemSix race bike has a very different fit from a 54cm Cannondale Synapse endurance bike, for example.įor all these reasons, it's impossible to look at any particular frame tube length and get a good idea of fit.Ĭomparing stack and reach makes things easier by giving you a straightforward method of comparing different bikes. Then sloping top tubes came in and complicated matters further by shortening seat tubes, and there's the massive variation in top tube and head tube lengths between different models to consider. A 56cm bike from one brand might fit you perfectly while a 56cm bike from another might feel way too small.Ī frame size used to refer to the length of the seat tube (and it still does in some cases) but it gives you no more information on the ride position you're likely to get. You know how shoes and jeans vary in size between manufacturers? It's the same with bikes.
#Crank arm length on 2018 stache 7 how to#
These figures allow you to assess quickly whether a bike is likely to offer the ride position you're after before you dig deeper (we're not covering how to determine the best stack and reach figures for you here we'd suggest you get a professional bike fit for that). Stack and reach don't tell you everything you need to know about a bike's geometry but they're a useful start. So stack and reach, expressed in either millimetres or centimetres, are measurements between the same two points, one being the vertical component and the other being the horizontal component. Reach The horizontal distance from the centre of the bottom bracket to the central point at the top of the head tube.
![crank arm length on 2018 stache 7 crank arm length on 2018 stache 7](https://images.factoryoemparts.com/media-pics/19307142-acdelco-platinum-spark-plugs-pack-of-4-new-gm-oem-19307142-41-805-19250977.jpeg)
![crank arm length on 2018 stache 7 crank arm length on 2018 stache 7](https://bmxmuseum.com/forsale/img_039357e0a34c37_lg.jpg)
Stack The vertical distance from the centre of the bottom bracket to the central point at the top of the head tube. Stack and reach are terms that get bandied around all the time in the bike world, but what exactly do they mean and why are they useful to know?īack in ye olde dayes comparing bike geometries was a matter of looking at tube lengths and angles and doing a bit of arithmetic, but then stack and reach came along – initially pushed by Canadian bike brand Cervélo and soon taken up by everyone else – and made things a whole lot easier.