Seat tube length is measured from either the centre of the bottom bracket to where the top tube and seat tube meet (Centre-Centre or C-C) or to the top of the seat tube (Centre-Top or C-T). The head tube length is measured from the bottom to the top of the head tube. As a rule of thumb, each 10mm spacer reduces the effective reach by about 3-4mm.
Climbing and descending place different demands on geometry, so it can be useful to think in terms of position when seated (going up) vs position when standing (going down!). Oversized seat posts provide stiffness and strength, whereas standard seat posts provide more in the way of comfort. You won’t be shown this message again :). You've been subscribed to our newsletter. The seat tube length defines the size of the bike in a more meaningful way than the ‘Small, Medium or Large’ size structure. Pin BikeCAD shortcut to taskbar, Windows 7 Pro, How to Fix Service Host Superfetch High Disk Usage in Windows 20, How to Stop Avast From Blocking a Program in Windows 2020 adminb.
It's important to know which 'handlebar width' measurement is being described as a 2cm difference could feel drastically different. If you’re using Blue Tack, make sure that the blob at the end of the string is fairly symmetric and your string hangs down straight otherwise your measure may be off. Discover more about belt drive bikes and some of the best to be had in 2018... Cross country mountain bike riders looking for a great, entry level hardtail, look no further. It's important to know straight off the top that bikes are not the same in terms of geometry and size. Saddle setback is measured horizontally from the tip of the saddle to the centre of the bottom bracket. Less commonly used. Head Tube Length. Open bike from CSV Building Specs Export? Thanks! © Geometry Geeks. So now you’ve got all the measurements you need to size up your frame. Therefore the quoted size of a bike isn't so useful when comparing across brands.
With the same seat angles, as frame sizes grow and the rider's seat height gets higher and higher, the seat moves further back and slackens the virtual angle. The wheelbase refers to the distance between the front and rear drop outs which coincide with the contact points to the ground of the front and rear wheel. Plus, mountain bikes in particular often have a kink in the seat tube, so you don’t want to follow the line of the tube itself, which will be longer. Dangerholm vs. Kapfinger: The World's Finest DH Bike Challenge - Pinkbike Poll, Qualifying Results: Lousa DH World Cup 2020 - Round 4, Pole Bicycles' CEO Resigns, Company Founder Leo Kokkonen to Take Leading Role, Update: Atherton Bikes Seeking Around £600,000 in Crowd Funding Investment, ep1.pinkbike.org/p4pb19134615/p4pb19134615.jpg, www.ncbi.nlm.nih.gov/pmc/articles/PMC5786204, docs.google.com/spreadsheets/d/1X0nk1vcS2gd268cD4K4GGA4Nf5GDsQ9hLhSex1beN-k/edit?usp=sharing, www.facebook.com/photo.php?fbid=3594925263869818&set=a.191507250878320&type=3&theater. Mountain bikes for example typically have head tube angles 70 degrees and below, so in order to speed up the steering, often the forks are offset to greater amounts. Conversely, a rider with poor flexibility or those who prefer a more upright riding position may opt for a shorter stem. It is closely related to stem length, as a short reach handlebar may need to be accompanied with a longer stem.
Head tube angle, fork rake, frame reach and chain stay length will dictate the length of the wheelbase. It’s not often quoted by bike makers, but BMC, for example, shows it on its geometry charts. On a road bike, stem length is one of the easiest ways to adjust your stretched-out-ness. Now just measure the distance between the top of the plumb line and the head tube and you’ve got your reach.
MTB bars have been growing steadily from under 700mm to over 800mm, giving more leverage and thus stability (but occasionally clipping trees!). Stem length varies based on bike designation, brand and even frame size and so is often one of the first things changed to suit a rider's flexibility or riding style. Paul has been riding since he was a teenager and has been writing about bike tech for almost five years. But if not, always taking the same reference point on the saddle, where it's 80mm wide, means you can then measure your height from there to the centre of the BB accurately and compare it to the geometry figures for certain bikes, or even replicate the same setup on other bikes with other saddles. Top tube length as measured from head tube axis to seat tube axis, along the tube itself. As the front of the bike increases in length, the rider's weight falls further back between the two contact patches. This gives an indication of how long a frame is. This information can be a little dry, but stick with us as it will help inform your future bike purchases and is applicable to any type of bike. If you’re thinking of buying a new bike, or a first bike, understanding the key measurements that define your frame is important to ensure that you get a machine that fits you and works for the type of riding that you intend to do. Wider bars create more stability and greater leverage which is great for sprinting or climbing but can make steering a little slow. Standover height or clearance is the height from the ground to the top tube.
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