Name: 2026 CTM Bikes Koyuk 3.0 Base
Brand: CTM Bikes

	520	540	560	580	600
Stack	530mm	548mm	566mm	585.5mm	604mm
Reach	380mm	390mm	400mm	405mm	415mm
Stack to Reach Ratio	1.39:1	1.41:1	1.42:1	1.45:1	1.46:1
Seat Tube Length, C-T	460mm	495mm	520mm	540mm	565mm
Top Tube Length, Effective/Horizontal HT Top	531mm	547mm	562.5mm	584mm	600mm
Top Tube Slope	9.8deg	7.8deg	6.9deg	7deg	6.3deg
Head Tube Angle	70.5deg	70.5deg	70.5deg	70.5deg	70.5deg
Seat Tube Angle	74deg	74deg	74deg	73deg	73deg
Head Tube Length	100mm	120mm	140mm	160mm	180mm
Bottom Bracket Drop	76mm	76mm	76mm	76mm	76mm
Bottom Bracket Height	280mm	280mm	280mm	280mm	280mm
Chainstay Length	430mm	430mm	430mm	435mm	435mm
Chainstay Length Horizontal	423.2mm	423.2mm	423.2mm	428.3mm	428.3mm
Front-Center	604mm	620mm	637mm	648mm	665mm
Front-Center Horizontal	598.8mm	615.8mm	631.8mm	643.7mm	660.5mm
Wheelbase	1022mm	1039mm	1055mm	1072mm	1088.8mm
Fork Offset/Rake	55mm	55mm	55mm	55mm	55mm
Fork Length (Axle-To-Crown)	400mm	400mm	400mm	400mm	400mm
Trail	67.7mm high	67.7mm high	67.7mm high	67.7mm high	67.7mm high
Mechanical Trail	63.8mm	63.8mm	63.8mm	63.8mm	63.8mm
Wheel Flop	21.3mm	21.3mm	21.3mm	21.3mm	21.3mm
Tire to Pedal Spindle	78mm 170 mm cranks	94mm 170 mm cranks	111mm 170 mm cranks	122mm 170 mm cranks	139mm 170 mm cranks
Pedal Spindle to Ground Clearance	110mm 170 mm cranks	110mm 170 mm cranks	110mm 170 mm cranks	110mm 170 mm cranks	110mm 170 mm cranks

Published Sizing Recommendations

Height

160 cm

170 cm

165 cm

175 cm

185 cm

190 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

2026 CTM Bikes Koyuk 3.0 Base