Throughout a day we hot-swapped between 0, 20 and 40 mm rise, all cut to 760 mm wide. In order to see how the bar height and position influences ride feel we headed to the Innerleithen trails with a brace of FatBar Lite flat and riser bars from Renthal for a day of back to back testing. Now we understand the terminology and differences between making adjustments with riser bars and headset spacers. This illustration shows why fitting a 40 mm riser bar is different from adding 40 mm of spacersįield testing Finding the correct MTB bar height for you. Riser bars make no change to the grip position in the horizontal plane in relationship with the head tube, adding or removing spacers changes the bars horizontal position as well as the vertical plane.
Adding 40 mm of spacers, in this case, would move the grips 36.24 mm upwards but also 16.88 mm backwards in relation to the head tube. For example, if your bike has a 65 degree head angle, a quick trigonometry equation shows that for every 10 mm of spacers you add, the stem moves 9.06 mm upwards, but importantly 4.22 mm rearwards. When you add spacers under the stem, however, you change the position of the stem on the steerer tube which is at an angle. For example, if you change from a flat bar to a 40 mm riser bar (assuming the backsweep and width remain the same) the contact point with your hands moves vertically upwards 40 mm. Adding 40 mm of spacers under the bar is NOT the same as adding a 40 mm riser bar. Riser bars vs Spacersįirst, it’s time to dispel a common misconception. Reach has nothing to do with the position of the seat and grips as many people think. Reach is the horizontal distance from the centre of the bottom bracket to the centre of the top of the head tube. Stack is the vertical distance measured from the centre of the frames bottom bracket to the centre of the top of the head tube (where the fork steerer enters the frame). What is Stack and Reach – understanding the terminologyīefore we delve into bar height, it’s important to understand some terminology, namely Stack and Reach.
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