'Fast' handling is good at high speeds, requiring less rider input but can be described as twitchy as it is so responsive. How far the bottom bracket is below a line drawn between front and rear axles. Bikes with a long head tube raises the front end of the bike, putting the rider in a more upright position. More trail feels more stable at speed, but can cause more 'flop' of the front wheel when turning more slowly. As a rule of thumb, each 10mm spacer reduces the effective reach by about 3-4mm. For this, most bike manufacturers select stem length based on optimal fit and handling, and so changing the stem length greatly can have negative effects. 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. Top tube length as measured from head tube axis to seat tube axis, along the tube itself. What are the downsides to the current way of measuring? The first measurement is from the center of the bottom bracket to the center of where the seat tube and top tube connect. Chainstay length is measured horizontally from the bottom bracket to the rear dropouts and influences the length of the wheelbase and handling. Fork length(3) Fork offset(4) Top tube length(5) Head tube length(6) Head tube angle(7) Seat tube angle(8) Chainstay length(9) Spacers height(10) Stem length(11) Stem angle(12) Wheelbase(13) Reach(frame)(14) Stack(frame)(15) Reach(spacers)(16) … The current version of BikeCAD is 16.0. Arguably the biggest advancement in mountain biking since suspension, we take you through all you need to know about dropper seatposts... Seeking a set-and-forget city bike? In order to prevent returns and help buyers select the right sized bike, many manufacturers that sell directly to the public with stipulate a maximum saddle height. With the seat up at a real pedalling position it moves back and away from the on-paper measurement. Adding in the seat height and offset from the BB to the actual seat tube angle give more information and make the virtual seat tube angle at that seat height match what we're riding in the real world. Seat tube length doesn't matter at all for fit. Reach is also sometimes used to describe a rider's reach which is different to the frame reach. Because road bike fit is so dependent on your body’s dimensions and your own flexibility and strength, a professional bike fit is often a good investment. The seat tube contains the seatpost of the bike, which connects to the saddle. This article spells out what each measurement refers to and how it is taken, along with how it influences ride quality and what you should be looking out for. Impressum. Distance from rear wheel axle to bottom bracket centre. Changing the saddle set back position can also influence the seat tube angle, effectively making it slacker or steeper. If you're super aero though, you might go narrower to keep your frontal area small. So once you’re set up to record your reach, you should also be able to measure your stack, following the plumb line. A modern enduro bike might be designed around a 40mm stem, an XC bike (or any MTB a few years old) might assume a 70mm stem. On time trial bikes, the saddle can often be repositioned to give a wide range of effective seat angles. It’s not often quoted by bike makers, but BMC, for example, shows it on its geometry charts. Many manufacturers size road bikes by top tube length. BikeCAD Pro customers can download the latest version as described here. Some brands, such as Moots, even mix the two! 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. Thanks! Go too low and your back and neck might start to ache on longer rides, though.

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