	S	M	L	XL	XXL
Stack	656mm	666mm	676mm	686mm	696mm
Reach	378mm	395mm	411mm	428mm	443mm
Stack to Reach Ratio	1.74:1	1.69:1	1.64:1	1.6:1	1.57:1
Seat Tube Length, C-T	405mm	445mm	483mm	533mm	555mm
Top Tube Length, Effective/Horizontal HT Top	585mm	603mm	622mm	642mm	655mm
Top Tube Slope	28.4deg	24.6deg	21.2deg	16.8deg	15.3deg
Head Tube Angle	70deg	70deg	70deg	70deg	70deg
Seat Tube Angle	72.5deg	72.5deg	72.5deg	72.5deg	72.5deg
Head Tube Length	115mm	125mm	135mm	145mm	170mm
Bottom Bracket Drop	75mm	75mm	75mm	75mm	75mm
Bottom Bracket Height	272mm	272mm	272mm	272mm	272mm
Chainstay Length	440mm	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	433.6mm	433.6mm	433.6mm	433.6mm	433.6mm
Front-Center	659.7mm	681.6mm	699.5mm	720.4mm	735.3mm
Front-Center Horizontal	655.4mm	677.4mm	695.4mm	716.4mm	731.4mm
Wheelbase	1089mm	1111mm	1129mm	1150mm	1165mm
Fork Offset/Rake	62mm	63.3mm	61.7mm	62.1mm	58.7mm
Trail	60.3mm mid/neutral	59mm mid/neutral	60.6mm mid/neutral	60.2mm mid/neutral	63.9mm mid/neutral
Mechanical Trail	56.7mm	55.4mm	57mm	56.6mm	60mm
Wheel Flop	19.4mm	19mm	19.5mm	19.4mm	20.5mm
Tire to Pedal Spindle	142.7mm 170 mm cranks	164.6mm 170 mm cranks	177.5mm 175 mm cranks	198.4mm 175 mm cranks	213.3mm 175 mm cranks
Pedal Spindle to Ground Clearance	102mm 170 mm cranks	102mm 170 mm cranks	97mm 175 mm cranks	97mm 175 mm cranks	97mm 175 mm cranks

Published Sizing Recommendations

Height

165 cm

171 cm

168 cm

179 cm

178 cm

186 cm

185 cm

201 cm

195 cm

205 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.1bike4life.com/rennstahl/bikes/853-pi-touring/#geometry

2026 Rennstahl Stahl Bikes 853 PI Touring