2020 Rocky Mountain Thunderbolt Alloy 50 Neutral

Design
Flat Bar, Full suspension
Frame
Aluminum
Suspension
140mm fork travel, 25% sag
Features
Disc brake
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Somewhat aggressive stack and reachvs category
Average stack and reachvs category

Geometry

XS
S
M
L
XL
Stack
579mm
588mm
598mm
607mm
626mm
Reach
386mm
414mm
436mm
459mm
479mm
Stack to Reach Ratio
1.5:1
1.42:1
1.37:1
1.32:1
1.31:1
Seat Tube Length, C-T
356mm
394mm
432mm
471mm
509mm
Top Tube Length, Effective/Horizontal Unknown
546mm
576mm
601mm
626mm
658mm
Head Tube Angle
66.6deg
66.6deg
66.6deg
66.6deg
66.6deg
Effective Seat Tube Angle, Unknown
74.6deg
74.6deg
74.6deg
74.6deg
74.6deg
Head Tube Length
100mm
110mm
120mm
130mm
145mm
Bottom Bracket Drop
17mm
17mm
17mm
17mm
17mm
Bottom Bracket Height
336mm
336mm
336mm
336mm
336mm
Chainstay Length Horizontal
425mm
425mm
425mm
425mm
425mm
Front-Center
678.2mm
710.2mm
736.2mm
763.2mm
795.2mm
Front-Center Horizontal
678mm
710mm
736mm
763mm
795mm
Wheelbase
1103mm
1135mm
1161mm
1188mm
1220mm
Fork Offset/Rake
37mm
37mm
37mm
37mm
37mm
Trail
112.4mm
very high
112.4mm
very high
112.4mm
very high
112.4mm
very high
112.4mm
very high
Mechanical Trail
103.2mm
103.2mm
103.2mm
103.2mm
103.2mm
Wheel Flop
41mm
41mm
41mm
41mm
41mm
Standover Height
802mm
802mm
802mm
802mm
802mm
Tire to Pedal Spindle
155.3mm
170 mm cranks
187.2mm
170 mm cranks
213.2mm
170 mm cranks
240.2mm
170 mm cranks
272.2mm
170 mm cranks
Pedal Spindle to Ground Clearance
166mm
170 mm cranks
166mm
170 mm cranks
166mm
170 mm cranks
166mm
170 mm cranks
166mm
170 mm cranks

Alloy 50 Neutral Build

XS
S
M
L
XL
Wheel Size
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
Tire Width
2.4in
2.4in
2.4in
2.4in
2.4in
Tire Width Max
2.5in
2.5in
2.5in
2.5in
2.5in
Tire Outer Diameter
705.9mm
705.9mm
705.9mm
705.9mm
705.9mm
Bike Length with Tires
1808.9mm
1840.9mm
1866.9mm
1893.9mm
1925.9mm

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
Source:https://www.bikes.com/en/bikes/thunderbolt/2020