2015 GT Bicycles Grade Alloy

	51	53	55	55	56	58	60
Stack	534mm	557mm	578mm	578mm	601mm	627mm	650mm
Reach	367mm	370mm	373mm	373mm	381mm	382mm	389mm
Stack to Reach Ratio	1.46:1	1.51:1	1.55:1	1.55:1	1.58:1	1.64:1	1.67:1
Seat Tube Length, C-T	495mm	535mm	550mm	550mm	560mm	605mm	635mm
Top Tube Length, Effective/Horizontal HT Top	515mm	535mm	—	550mm	565mm	580mm	600mm
Top Tube Length, Effective/Horizontal Unknown	—	—	550mm	—	—	—	—
Top Tube Slope	6.5deg	4.8deg	5.6deg	5.6deg	6.9deg	5.1deg	4.5deg
Head Tube Angle	69deg	70deg	70.5deg	70.5deg	71.5deg	72deg	72deg
Seat Tube Angle	74.5deg	73.5deg	73deg	73deg	73deg	72.5deg	72deg
Head Tube Length	121mm	142mm	162mm	162mm	182mm	207mm	231mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	276mm	276mm	274mm	276mm	276mm	276mm	276mm
Chainstay Length	430mm	430mm	430mm	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	424.3mm	424.3mm	424.3mm	424.3mm	424.3mm	424.3mm	424.3mm
Front-Center	597mm	599mm	605mm	605mm	610mm	615mm	628mm
Front-Center Horizontal	592.7mm	594.7mm	600.7mm	600.7mm	606.7mm	610.7mm	624.7mm
Wheelbase	1017mm	1019mm	1025mm	1025mm	1031mm	1035mm	1049mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm	45mm	45mm
Trail	84.6mm very high	78.1mm high	74.1mm high	74.8mm high	68.3mm high	65.1mm high	65.1mm high
Mechanical Trail	79mm	73.3mm	69.8mm	70.5mm	64.8mm	61.9mm	61.9mm
Wheel Flop	28.3mm	25.1mm	23.3mm	23.5mm	20.6mm	19.1mm	19.1mm
Standover Height	742mm	772mm	786mm	786mm	800mm	829mm	843mm
Tire to Pedal Spindle	81mm 170 mm cranks	83mm 170 mm cranks	91mm 170 mm cranks	89mm 170 mm cranks	94mm 170 mm cranks	99mm 170 mm cranks	112mm 170 mm cranks
Pedal Spindle to Ground Clearance	106mm 170 mm cranks	106mm 170 mm cranks	104mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks

	51	53	55	55	56	58	60
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	35mm	35mm	33mm	35mm	35mm	35mm	35mm
Tire Outer Diameter	692mm	692mm	688mm	692mm	692mm	692mm	692mm
Bike Length with Tires	1709mm	1711mm	1713mm	1717mm	1723mm	1727mm	1741mm

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.

Learn more about the Upright/Aggressive Scale

Category Trend

Endurance Road

Source:https://web.archive.org/web/20150423082102/http://www.gtbicycles.com/usa_en/2015/bikes/road/grade-alloy-105, https://geometrygeeks.bike/bike/gt-grade-al-claris-2015/

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2015 GT Bicycles Grade Alloy

Geometry

Alloy Build

Stack and Reach vs. Category Trend