When comparing reach between bikes remember the one with the higher stack height will feel longer than its reach figure would suggest. This demonstrates how reach measurements are affected by stack height. But if you used headset spacers on the original bike, such that the bar height was the same, both bikes would feel identical to ride. That’s because the head angle is not vertical – so, the longer the head tube, the further back the top of it becomes, and so the shorter the reach measurement. Now if you measured the reach of those two bikes, the one with the extended head tube would measure shorter. Take two identical bikes, then make the head tube of one bike taller, so it has a higher stack height. There is one small caveat to that though, and it’s to do with the stack height. Along with the stem length, it defines how roomy the bike will feel when ridden out of the saddle, and alongside the effective seat angle, it determines how roomy the bike will feel when in the saddle too. Of all the commonly available numbers in a bike’s geometry chart, reach provides the best impression of how a bike will fit. Definition: The horizontal distance from the bottom bracket to the centre of the top of the head tube.
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