seat tube length

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.

(Conversely, shorter chainstays can make a bike feel more playful - quicker to turn and easier to manual - at the expense of wheelbase length.) Open bike from CSV Building Specs Export? The actual is following the axis of our physical seat tube. Generally speaking, bikes with a 'long' wheelbase deliver stability and comfort, whereas bikes with a 'short' wheelbase leads to sharper handling. Useful because you can measure it and helps you work out how much seatpost you need. A belt-drive bike won’t disappoint. 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). What is the ideal fit? As you can imagine mountain bikes have much wider bars than road bikes improve stability and control. Stack and reach go hand-in-hand to give a useful X-Y position of the front of the bike, before you add a stem (and consider its length, angle and any spacers). What are the downsides to the current way of measuring? Having worked with some of the tallest engineers in the industry (that's you French Dave), this stratospheric seat height isn't all that far fetched. In the same way that measuring your seat tube angle level with the top of the head tube doesn't represent real life, so too is measuring the effective top tube from it. 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? Final Results: Lousa World Cup DH 2020 - Round 3, Final Results: Lousa DH World Cup 2020 - Round 4, Qualifying Results: Lousa DH World Cup 2020 - Round 3. Bike frames are commonly measured in centimetres representing the length of the seat tube. Handlebar width on road bikes is measured either 'centre to centre' and referred to as 'C-C' or 'outside to outside' and referred to as 'O-O'. 12x148 Boost or 135x9 QR. A bigger drop lowers your centre of gravity, good for cornering but less good for catching your pedals on the ground! Distance from centre of bottom bracket to the front axle. Diameter of seatpost required for the frame. What could we implement to make measuring seat tube angles better? By continuing to use the site you accept our cookie policy. Changing the saddle set back position can virtually influence the seat tube angle, effectively making is slacker or steeper. The below image shows an example of how an increase in fork offset or rake which reduces the amount of trail and as a consequence speeds up the bike's handling. It matters a bit for weight and ride quality, but the geometry of fit depends on the relative position of the bottom bracket, saddle, and the top of the head tube (or the brake hoods, to measure a different way). To understand fork rake, imagine a straight line continuing from the centre of the fork’s steerer tube all the way to the ground. Driven by the rise of Enduro (and the dropper seatpost), the last 10 years have seen a marked trend towards longer, lower, slacker bikes. The first measurement is from the center of the bottom bracket to the center of where the seat tube and top tube connect. Some frames may require specific shapes of seatpost (e.g. Rider reach refers to the rider specifically and is measured from the tip of the saddle to the end of the stem. It’s another key measurement quoted by bike brands on their geo charts. While lower is typically better, this does need to be balanced with pedal clearance when cornering, too low of a bottom bracket drop could lead to you touching your pedal on the ground and crashing. "Centre to Centre" or C-C is the length from bottom bracket centre to the middle of where the top tube meets the seat tube. Typically speaking, modern endurance road bikes are coming with shorter reach handlebars, while race-focused models still use a longer reach as it allows for a more aggressive riding position. That depends on your style of riding and your priorities. This measurement is called Seat tube length (c-t). BikeCAD Pro customers can download the latest version as described here. A straight seat tube, pointing directly to the center of the bottom bracket means only one seat angle. The long-low-slack trend is not just for enduro-oriented bikes either; the latest crop of XC bikes also feature long reaches and slack head angles (BB height is more affected by suspension travel and wheel size). This measurement is called Seat tube length (c-c). Engineers and designers had to move the physical tube out of the way to provide some clearance. Length originally specified as part of the complete bike. This was the case for a long time, and on some bikes it still is. A slack head tube angle requires more effort to steer but performs better at slow speeds. Line up your straight edge with the bottom bracket centre and the top of the seat tube and measure along this, if you’re not sure you’re following the right line. This measurement is called Seat tube length (c-c). On mountain bikes where seat tube does not intersect the BB, the actual angle is sometimes given. "Effective" is the length from the bottom bracket centre to the point where a horizontal line from the top of the head tube meets the seat tube axis. 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. To imagine this, think of a performance race bike with a steep headtube and increase fork offset, which equals a small amount of trail and a 'fast' handling bike. We’ve published a more detailed explanation of why reach and stack are important here. Like reach and stack, it’s worth repeating the measurement several times to make sure you get the same number. Seat Tube Length "Centre to Top" or C-T is the length from bottom bracket centre to top of seat tube. The second measurement is from the center of the bottom bracket to the top of the seat tube. On a suspension fork this is measured with fork uncompressed. A bike's geometry strongly influences its handling, your comfort, your aerodynamics and your power output.

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,,,, 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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