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2021 Transition Bikes Spire Base

Category
Full-suspension All-mountain/Enduro MTB
Design
Flat Bar, Full suspension
Suspension
170mm fork travel, 170mm rear travel
Features
Disc brake
SM Low
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I've Ridden
S High
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I've Ridden
MD Low
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I've Ridden
MD High
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I've Ridden
LG Low
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I've Ridden
LG High
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XL Low
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XL High
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I've Ridden
XXL Low
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XXL High
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I've Ridden
Somewhat upright stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat upright stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Geometry

SM Low
S High
MD Low
MD High
LG Low
LG High
XL Low
XL High
XXL Low
XXL High
Stack
624mm
619mm
624mm
619mm
633mm
628mm
642mm
637mm
651mm
646mm
Reach
425mm
430mm
455mm
460mm
480mm
485mm
505mm
510mm
530mm
535mm
Stack to Reach Ratio
1.47:1
1.44:1
1.37:1
1.35:1
1.32:1
1.29:1
1.27:1
1.25:1
1.23:1
1.21:1
Seat Tube Length, Unknown
360mm
360mm
390mm
390mm
430mm
430mm
460mm
460mm
490mm
490mm
Top Tube Length, Effective/Horizontal Unknown
550mm
547mm
580mm
577mm
608mm
605mm
636mm
633mm
664mm
661mm
Head Tube Angle
62.5deg
63deg
62.5deg
63deg
62.5deg
63deg
62.5deg
63deg
62.5deg
63deg
Effective Seat Tube Angle, Unknown
79.1deg
79.6deg
78.3deg
78.8deg
77.6deg
78.1deg
77deg
77.5deg
76.7deg
77.2deg
Head Tube Length
100mm
100mm
100mm
100mm
110mm
110mm
120mm
120mm
130mm
130mm
Bottom Bracket Drop
32mm
25mm
32mm
25mm
32mm
25mm
32mm
25mm
32mm
25mm
Bottom Bracket Height
340mm
347mm
340mm
347mm
340mm
347mm
340mm
347mm
340mm
347mm
Chainstay Length
448mm
446mm
448mm
446mm
448mm
446mm
454mm
452mm
454mm
452mm
Chainstay Length Horizontal
446.9mm
445.3mm
446.9mm
445.3mm
446.9mm
445.3mm
452.9mm
451.3mm
452.9mm
451.3mm
Front-Center
782.8mm
682.2mm
812.8mm
812.1mm
842.8mm
842.1mm
871.7mm
871.1mm
901.7mm
901mm
Front-Center Horizontal
782.1mm
681.7mm
812.1mm
811.7mm
842.1mm
841.7mm
871.1mm
870.7mm
901.1mm
900.7mm
Wheelbase
1229mm
1127mm
1259mm
1257mm
1289mm
1287mm
1324mm
1322mm
1354mm
1352mm
Fork Offset/Rake
44mm
44mm
44mm
44mm
44mm
44mm
44mm
44mm
44mm
44mm
Fork Length (Axle-To-Crown)
584mm
584mm
584mm
584mm
584mm
584mm
584mm
584mm
584mm
584mm
Trail
144mm
very high
140.1mm
very high
144mm
very high
140.1mm
very high
144mm
very high
140.1mm
very high
144mm
very high
140.1mm
very high
144mm
very high
140.1mm
very high
Mechanical Trail
127.8mm
124.9mm
127.8mm
124.9mm
127.8mm
124.9mm
127.8mm
124.9mm
127.8mm
124.9mm
Wheel Flop
59mm
56.7mm
59mm
56.7mm
59mm
56.7mm
59mm
56.7mm
59mm
56.7mm
Standover Height
680mm
685mm
695mm
700mm
710mm
715mm
725mm
730mm
740mm
745mm
Tire to Pedal Spindle
245.8mm
165 mm cranks
145.2mm
165 mm cranks
275.8mm
165 mm cranks
275.1mm
165 mm cranks
305.8mm
165 mm cranks
305.1mm
165 mm cranks
334.8mm
165 mm cranks
334.1mm
165 mm cranks
364.7mm
165 mm cranks
364.1mm
165 mm cranks
Pedal Spindle to Ground Clearance
175mm
165 mm cranks
182mm
165 mm cranks
175mm
165 mm cranks
182mm
165 mm cranks
175mm
165 mm cranks
182mm
165 mm cranks
175mm
165 mm cranks
182mm
165 mm cranks
175mm
165 mm cranks
182mm
165 mm cranks

Base Build

SM Low
S High
MD Low
MD High
LG Low
LG High
XL Low
XL High
XXL Low
XXL High
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
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
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
2.4in
2.4in
2.4in
2.4in
2.4in
2.4in
2.4in
2.4in
2.4in
2.4in
Tire Width Max
2.6in
2.6in
2.6in
2.6in
2.6in
2.6in
2.6in
2.6in
2.6in
2.6in
Tire Outer Diameter
743.9mm
743.9mm
743.9mm
743.9mm
743.9mm
743.9mm
743.9mm
743.9mm
743.9mm
743.9mm
Bike Length with Tires
1972.9mm
1870.9mm
2002.9mm
2000.9mm
2032.9mm
2030.9mm
2067.9mm
2065.9mm
2097.9mm
2095.9mm
Crank Length
165mm
165mm
165mm
165mm
165mm
165mm
165mm
165mm
165mm
165mm
Handlebar Width
800mm
800mm
800mm
800mm
800mm
800mm
800mm
800mm
800mm
800mm
Stem Length
20mm
20mm
30mm
30mm
30mm
30mm
30mm
30mm
40mm
40mm

Published Sizing Recommendations

Height
5 ft 0 in
to
5 ft 6 in
5 ft 0 in
to
5 ft 6 in
5 ft 5 in
to
6 ft 0 in
5 ft 5 in
to
6 ft 0 in
5 ft 9 in
to
6 ft 3 in
5 ft 9 in
to
6 ft 3 in
6 ft 1 in
to
6 ft 6 in
6 ft 1 in
to
6 ft 6 in
6 ft 3 in
to
6 ft 8 in
6 ft 3 in
to
6 ft 8 in

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
Full-suspension All-mountain/Enduro MTB
Source:https://www.transitionbikes.com/Bikes_Spire.cfm
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