2018 GT Bicycles GTR Series Alloy Base

	47cm	49cm	510	530	550	570
Seat Tube Length, Unknown	470mm	490mm	510mm	530mm	550mm	570mm
Top Tube Length, Effective/Horizontal Unknown	525mm	535mm	545mm	560mm	575mm	590mm
Head Tube Angle	72deg	72.5deg	72.5deg	72.5deg	73deg	73deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73.5deg	73deg	72.5deg
Head Tube Length	120mm	130mm	150mm	170mm	190mm	210mm
Bottom Bracket Drop	66mm	66mm	66mm	64mm	64mm	64mm
Bottom Bracket Height	268mm	268mm	268mm	270mm	270mm	270mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm	410mm
Chainstay Length Horizontal	404.7mm	404.7mm	404.7mm	405mm	405mm	405mm
Front-Center	569.5mm	571.8mm	577.4mm	593mm	599.7mm	608.2mm
Front-Center Horizontal	565.7mm	568mm	573.7mm	589.5mm	596.2mm	604.8mm
Wheelbase	970.3mm	972.6mm	978.3mm	994.5mm	1001.2mm	1009.8mm
Trail	— —	— —	— —	— —	— —	— —
Mechanical Trail	—	—	—	—	—	—
Wheel Flop	—	—	—	—	—	—
Standover Height	727.4mm	742.2mm	760.8mm	781mm	800.4mm	818.9mm
Tire to Pedal Spindle	65.5mm 170 mm cranks	67.8mm 170 mm cranks	73.4mm 170 mm cranks	89mm 170 mm cranks	95.7mm 170 mm cranks	104.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	98mm 170 mm cranks	98mm 170 mm cranks	98mm 170 mm cranks	100mm 170 mm cranks	100mm 170 mm cranks	100mm 170 mm cranks

	47cm	49cm	510	530	550	570
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
Tire Width	23mm	23mm	23mm	23mm	23mm	23mm
Tire Width Max	23mm	23mm	23mm	23mm	23mm	23mm
Tire Outer Diameter	668mm	668mm	668mm	668mm	668mm	668mm
Bike Length with Tires	1638.3mm	1640.6mm	1646.3mm	1662.5mm	1669.2mm	1677.8mm

Source:http://www.bikesdirect.com/products/gt/images/gt_12_Catalog_GEO.pdf

Geometry