Actual Frame Size 15.5" 16.5" 18" 20"
Effective seat tube angle 70.0 ° 70.0 ° 70.0 ° 70.0 °
ASeat tube 39.4 44.5 48.3 53.3
BSeat tube angle 73.8 ° 73.8 ° 73.8 ° 73.8 °
CHead tube length 10.5 11.5 12.5 13.5
DHead angle 70.0 ° 70.0 ° 70.0 ° 70.0 °
EEffective top tube 55.6 58.8 60.6 62.8
FBottom bracket height 33.0 33.0 33.0 33.0
GBottom bracket drop 3.9 3.9 3.9 3.9
HChainstay length 45.2 45.2 45.2 45.2
IOffset 5.1 5.1 5.1 5.1
JTrail 8.0 8.0 8.0 8.0
KWheelbase 109.9 113.1 114.9 117.1
LStandover 78.0 77.1 76.3 77.7
MFrame reach 39.2 42.1 43.6 45.4
NFrame stack 59.3 60.3 61.2 62.1
Actual Frame Size 15.5" 16.5" 18" 20"
Effective seat tube angle 70.0 ° 70.0 ° 70.0 ° 70.0 °
ASeat tube 15.51 17.52 19.02 20.98
BSeat tube angle 73.8 ° 73.8 ° 73.8 ° 73.8 °
CHead tube length 4.13 4.53 4.92 5.31
DHead angle 70.0 ° 70.0 ° 70.0 ° 70.0 °
EEffective top tube 21.89 23.15 23.86 24.72
FBottom bracket height 12.99 12.99 12.99 12.99
GBottom bracket drop 1.54 1.54 1.54 1.54
HChainstay length 17.80 17.80 17.80 17.80
IOffset 2.01 2.01 2.01 2.01
JTrail 3.15 3.15 3.15 3.15
KWheelbase 43.27 44.53 45.24 46.10
LStandover 30.71 30.35 30.04 30.59
MFrame reach 15.43 16.57 17.17 17.87
NFrame stack 23.35 23.74 24.09 24.45

Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorized Trek retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs