Name: 2026 RB Bike RX 2026 Base
Brand: RB Bike

	S	M	L	XL	2XL
Stack	538mm	561mm	578mm	601mm	636mm
Reach	396mm	404mm	424mm	426mm	436mm
Stack to Reach Ratio	1.36:1	1.39:1	1.36:1	1.41:1	1.46:1
Seat Tube Length, C-T	430mm	470mm	500mm	530mm	560mm
Top Tube Length, Effective/Horizontal Center	540mm	565mm	590mm	610mm	630mm
Top Tube Slope	13.6deg	11.6deg	9.8deg	9.2deg	9.5deg
Head Tube Angle	69deg	69deg	69.5deg	69.5deg	70deg
Seat Tube Angle	75deg	74deg	74deg	73deg	73deg
Head Tube Length	110mm	135mm	150mm	175mm	210mm
Bottom Bracket Drop	80mm	80mm	80mm	80mm	80mm
Bottom Bracket Height	276mm	276mm	276mm	276mm	276mm
Chainstay Length	433mm	433mm	433mm	433mm	433mm
Chainstay Length Horizontal	425.6mm	425.6mm	425.6mm	425.6mm	425.6mm
Front-Center	629.6mm	647.4mm	668.3mm	679.2mm	694.1mm
Front-Center Horizontal	624.5mm	642.5mm	663.5mm	674.5mm	689.5mm
Wheelbase	1050mm	1068mm	1089mm	1100mm	1115mm
Fork Offset/Rake	49.2mm	50.2mm	49.9mm	50.3mm	48mm
Trail	84mm very high	82.8mm very high	79.8mm high	79.4mm high	78.5mm high
Mechanical Trail	78.4mm	77.3mm	74.8mm	74.4mm	73.8mm
Wheel Flop	28.1mm	27.7mm	26.2mm	26.1mm	25.2mm
Standover Height	736mm	766mm	789mm	814mm	846mm
Tire to Pedal Spindle	103.6mm 170 mm cranks	121.4mm 170 mm cranks	142.3mm 170 mm cranks	153.2mm 170 mm cranks	168.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks

Published Sizing Recommendations

Height

155 cm

166 cm

164 cm

176 cm

174 cm

186 cm

184 cm

196 cm

194 cm

200 cm

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.rb-bike.cz/rb-bike-katalog/xc-trail/rx/ram/

2026 RB Bike RX 2026 Base