2025 Author Guru Base

Design
Drop Bar, Rigid, non-suspension corrected
Frame
Carbon/Composite
Fork
Carbon/Composite
Features
Disc brake
Average stack and reachvs category
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category

Geometry

470
510
540
570
Stack
567mm
586mm
603mm
624mm
Reach
381mm
394mm
406mm
417mm
Stack to Reach Ratio
1.49:1
1.49:1
1.49:1
1.5:1
Seat Tube Length, C-T
480mm
510mm
540mm
570mm
Top Tube Length, Effective/Horizontal HT Top
549mm
567mm
585mm
602mm
Top Tube Slope
11.7deg
10.2deg
8.7deg
7.6deg
Head Tube Angle
70.5deg
71deg
71deg
71deg
Seat Tube Angle
73.5deg
73.5deg
73.5deg
73.5deg
Head Tube Length
130mm
150mm
170mm
190mm
Bottom Bracket Drop
74mm
74mm
74mm
74mm
Bottom Bracket Height
275mm
275mm
275mm
275mm
Chainstay Length
435mm
435mm
435mm
435mm
Chainstay Length Horizontal
428.7mm
428.7mm
428.7mm
428.7mm
Front-Center
610.8mm
624.7mm
644.6mm
661.5mm
Front-Center Horizontal
606.3mm
620.3mm
640.3mm
657.3mm
Wheelbase
1035mm
1049mm
1069mm
1086mm
Fork Offset/Rake
47.9mm
47.9mm
47.9mm
47.9mm
Fork Length (Axle-To-Crown)
408mm
408mm
408mm
408mm
Trail
72.8mm
high
69.5mm
high
69.5mm
high
69.5mm
high
Mechanical Trail
68.6mm
65.7mm
65.7mm
65.7mm
Wheel Flop
22.9mm
21.4mm
21.4mm
21.4mm
Tire to Pedal Spindle
91.8mm
170 mm cranks
105.7mm
170 mm cranks
125.6mm
170 mm cranks
142.5mm
170 mm cranks
Pedal Spindle to Ground Clearance
105mm
170 mm cranks
105mm
170 mm cranks
105mm
170 mm cranks
105mm
170 mm cranks

Base Build

470
510
540
570
Wheel Size
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
Tire Width
38mm
38mm
38mm
38mm
Tire Outer Diameter
698mm
698mm
698mm
698mm
Bike Length with Tires
1733mm
1747mm
1767mm
1784mm

Stack and Reach vs. Category Trend

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.

Learn more about the Upright/Aggressive Scale
Category Trend
All-road/Gravel
Source:http