2025 CHIRU Nanulak Fat

	S	M	L
Stack	616mm	625mm	635mm
Reach	398mm	430mm	452mm
Stack to Reach Ratio	1.55:1	1.45:1	1.4:1
Seat Tube Length, C-C	430mm	480mm	530mm
Top Tube Length, Effective/Horizontal HT Top	575mm	610mm	640mm
Head Tube Angle	68.5deg	68.5deg	68.5deg
Seat Tube Angle	74deg	74deg	73.5deg
Head Tube Length	115mm	125mm	135mm
Bottom Bracket Drop	75mm	75mm	75mm
Bottom Bracket Height	331.5mm	331.5mm	331.5mm
Chainstay Length Horizontal	580mm	580mm	590mm
Front-Center	664.3mm	700mm	724.9mm
Front-Center Horizontal	660mm	696mm	721mm
Wheelbase	1240mm	1276mm	1311mm
Fork Offset/Rake	50mm	50mm	50mm
Fork Length (Axle-To-Crown)	485mm	485mm	485mm
Trail	106.4mm very high	106.4mm very high	106.4mm very high
Mechanical Trail	99mm	99mm	99mm
Wheel Flop	36.3mm	36.3mm	36.3mm
Tire to Pedal Spindle	87.8mm 170 mm cranks	123.5mm 170 mm cranks	148.4mm 170 mm cranks
Pedal Spindle to Ground Clearance	161.5mm 170 mm cranks	161.5mm 170 mm cranks	161.5mm 170 mm cranks

Published Sizing Recommendations

Height	164 cm to 173 cm	174 cm to 183 cm	184 cm to 195 cm
PBH	75 cm to 84 cm	78 cm to 87 cm	83 cm to 93 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.

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Source:https://www.chirubikes.com/en/kit-cadre/nanulak/