1991 Bridgestone Cycle Co. RB-2 Base

	50cm	53cm	56cm	59cm	62cm
Stack	497.2mm	524.9mm	552.4mm	579.7mm	608.3mm
Reach	392mm	399mm	406mm	413mm	419mm
Stack to Reach Ratio	1.27:1	1.32:1	1.36:1	1.4:1	1.45:1
Seat Tube Length, C-T	500mm	530mm	560mm	590mm	620mm
Seat Tube Length, C-C	482.5mm	512.5mm	542.5mm	572.5mm	602.5mm
Top Tube Length, Effective/Horizontal Center	525mm	545mm	565mm	585mm	600mm
Top Tube Length, Actual C-C	525mm	545mm	565mm	585mm	600mm
Top Tube Slope	0deg	0deg	0deg	0deg	0deg
Head Tube Angle	72.5deg	73deg	73.5deg	74deg	74.5deg
Seat Tube Angle	74deg	73.5deg	73deg	72.5deg	72.5deg
Bottom Bracket Drop	75mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	261mm	266mm	266mm	266mm	266mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm
Chainstay Length Horizontal	403.1mm	404mm	404mm	404mm	404mm
Front-Center	574mm	580mm	590mm	595mm	604mm
Front-Center Horizontal	569.9mm	575mm	586mm	591mm	600mm
Wheelbase	973mm	979mm	990mm	995mm	1004mm
Fork Offset/Rake	50mm	45mm	45mm	40mm	40mm
Trail	53.5mm mid/neutral	55.7mm mid/neutral	52.6mm mid/neutral	54.7mm mid/neutral	51.7mm mid/neutral
Mechanical Trail	51mm	53.2mm	50.4mm	52.6mm	49.8mm
Wheel Flop	15.4mm	15.6mm	14.3mm	14.5mm	13.3mm
Standover Height	743mm	773mm	800mm	828mm	856mm
Tire to Pedal Spindle	68mm 170 mm cranks	74mm 170 mm cranks	79mm 175 mm cranks	84mm 175 mm cranks	93mm 175 mm cranks
Pedal Spindle to Ground Clearance	91mm 170 mm cranks	96mm 170 mm cranks	91mm 175 mm cranks	91mm 175 mm cranks	91mm 175 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.sheldonbrown.com/bridgestone/1991/pages/bridgestone-1991-35.htm

Geometry