2020 Transition Bikes Sentinel Base

	SM	MD	LG	XL	XXL
Stack	613mm	622mm	631mm	640mm	649mm
Reach	420mm	450mm	476mm	501mm	521mm
Stack to Reach Ratio	1.46:1	1.38:1	1.33:1	1.28:1	1.25:1
Seat Tube Length, Unknown	350mm	390mm	430mm	460mm	490mm
Top Tube Length, Effective/Horizontal Unknown	552mm	585mm	613mm	641mm	665mm
Top Tube Slope	27.8deg	23.7deg	20deg	17.5deg	15.3deg
Head Tube Angle	63.6deg	63.6deg	63.6deg	63.6deg	63.6deg
Seat Tube Angle	70.8deg	70.8deg	70.8deg	70.8deg	70.8deg
Effective Seat Tube Angle, Unknown	78.2deg	77.5deg	76.9deg	76.4deg	76deg
Head Tube Length	100mm	110mm	120mm	130mm	140mm
Bottom Bracket Drop	29mm	29mm	29mm	29mm	29mm
Bottom Bracket Height	343mm	343mm	343mm	343mm	343mm
Chainstay Length	440mm	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	439mm	439mm	439mm	439mm	439mm
Front-Center	760.5mm	794.5mm	824.5mm	853.5mm	877.4mm
Front-Center Horizontal	760mm	794mm	824mm	853mm	877mm
Wheelbase	1199mm	1233mm	1263mm	1292mm	1316mm
Fork Offset/Rake	43mm	43mm	43mm	43mm	43mm
Trail	136.6mm very high	136.6mm very high	136.6mm very high	136.6mm very high	136.6mm very high
Mechanical Trail	122.4mm	122.4mm	122.4mm	122.4mm	122.4mm
Wheel Flop	54.4mm	54.4mm	54.4mm	54.4mm	54.4mm
Standover Height	671mm	688mm	700mm	712mm	722mm
Tire to Pedal Spindle	218.6mm 170 mm cranks	252.5mm 170 mm cranks	282.5mm 170 mm cranks	311.5mm 170 mm cranks	335.5mm 170 mm cranks
Pedal Spindle to Ground Clearance	173mm 170 mm cranks	173mm 170 mm cranks	173mm 170 mm cranks	173mm 170 mm cranks	173mm 170 mm cranks

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://www.transitionbikes.com/Bikes_Sentinel2.cfm#GEO

Geometry