Actual Frame Size 15.5" 16.5" 17.5" 18.5" 20.5"
ASeat tube 36.8 41.9 44.5 47.0 52.1
BSeat tube angle 73.0 ° 73.0 ° 73.0 ° 73.0 ° 73.0 °
CHead tube length 9.5 10.0 11.0 12.0 14.0
DHead angle 68.0 ° 68.0 ° 68.0 ° 68.0 ° 68.0 °
EEffective top tube 55.5 58.8 60.8 62.7 65.3
FBottom bracket height 33.3 33.3 33.3 33.3 33.3
GBottom bracket drop 1.7 1.7 1.7 1.7 1.7
HChainstay length 43.3 43.3 43.3 43.3 43.3
IOffset 4.4 4.4 4.4 4.4 4.4
JTrail 8.4 8.4 8.4 8.4 8.4
KWheelbase 110.1 113.7 115.5 117.0 119.4
LStandover 74.0 73.0 73.0 74.0 74.2
MFrame reach 37.4 41.5 43.2 44.9 46.9
Assumed fork sag 10% 10% 10% 10% 10%
NFrame stack 56.0 65.5 57.4 58.3 60.2
Assumed shock sag 25% 25% 25% 25% 25%
Actual Frame Size 15.5" 16.5" 17.5" 18.5" 20.5"
ASeat tube 14.49 16.50 17.52 18.50 20.51
BSeat tube angle 73.0 ° 73.0 ° 73.0 ° 73.0 ° 73.0 °
CHead tube length 3.74 3.94 4.33 4.72 5.51
DHead angle 68.0 ° 68.0 ° 68.0 ° 68.0 ° 68.0 °
EEffective top tube 21.85 23.15 23.94 24.68 25.71
FBottom bracket height 13.11 13.11 13.11 13.11 13.11
GBottom bracket drop .67 .67 .67 .67 .67
HChainstay length 17.05 17.05 17.05 17.05 17.05
IOffset 1.73 1.73 1.73 1.73 1.73
JTrail 3.31 3.31 3.31 3.31 3.31
KWheelbase 43.35 44.76 45.47 46.06 47.01
LStandover 29.13 28.74 28.74 29.13 29.21
MFrame reach 14.72 16.34 17.01 17.68 18.46
Assumed fork sag 10% 10% 10% 10% 10%
NFrame stack 22.05 25.79 22.60 22.95 23.70
Assumed shock sag 25% 25% 25% 25% 25%

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.