2025 ULT.RA Kross Esker 5.0 Base

	XS (17") 28"	S (18") 28"	M (19") 28"	L (20") 28"	XL (21") 28"
Stack	558mm	572mm	586mm	605mm	624mm
Reach	365mm	376mm	387mm	398mm	406mm
Stack to Reach Ratio	1.53:1	1.52:1	1.51:1	1.52:1	1.54:1
Seat Tube Length, C-T	435mm	460mm	485mm	510mm	535mm
Top Tube Length, Effective/Horizontal Center	530mm	545mm	561mm	577mm	591mm
Top Tube Slope	16.1deg	14.5deg	13deg	12deg	11.2deg
Head Tube Angle	71deg	71deg	71deg	71deg	71deg
Seat Tube Angle	73.5deg	74deg	74deg	74deg	74deg
Head Tube Length	105mm	120mm	135mm	155mm	175mm
Bottom Bracket Drop	75mm	75mm	75mm	75mm	75mm
Bottom Bracket Height	281mm	281mm	281mm	281mm	281mm
Chainstay Length	430mm	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	423.4mm	423.4mm	423.4mm	423.4mm	423.4mm
Front-Center	593.4mm	609.2mm	626.1mm	643mm	657.9mm
Front-Center Horizontal	588.6mm	604.6mm	621.6mm	638.6mm	653.6mm
Wheelbase	1012mm	1028mm	1045mm	1062mm	1077mm
Fork Offset/Rake	54.2mm	54.3mm	55.5mm	54.9mm	55.4mm
Trail	65.3mm high	65.1mm high	63.9mm mid/neutral	64.5mm mid/neutral	64mm mid/neutral
Mechanical Trail	61.7mm	61.6mm	60.5mm	61mm	60.5mm
Wheel Flop	20.1mm	20.1mm	19.7mm	19.9mm	19.7mm
Tire to Pedal Spindle	72.4mm 165 mm cranks	83.2mm 170 mm cranks	97.6mm 172.5 mm cranks	112mm 175 mm cranks	126.9mm 175 mm cranks
Pedal Spindle to Ground Clearance	116mm 165 mm cranks	111mm 170 mm cranks	108.5mm 172.5 mm cranks	106mm 175 mm cranks	106mm 175 mm cranks

Published Sizing Recommendations

Height

163 cm

170 cm

168 cm

174 cm

173 cm

179 cm

177 cm

183 cm

181 cm

187 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://kross.pl/esker-5-0-ult-ra-perlowy-holo-polysk