Dimensionally, the 2018 frame has a slacker 27.5-degree head angle, 3mm-shorter wheelbase, 2mm less trail and a swingarm
that is 15mm shorter than 2017.
The over-square engine’s bore and stroke are now 79mm
x 50.9mm (previously 76.8mm x 53.8mm). The compression
ratio is upped from 13.8:1 to 13.9:1.
In total, the 2018 frame is 340 grams lighter than last year.
That is two-thirds of a pound. The thin-wall 0.8mm Ti gas
tank is 1 pound, 2 ounces lighter than last year’s 3.2mm-thick