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Shock Sizes Explained

Manitou MaraThere is no such thing as a standard size in biking.  The best we can do is the size everyone decides to use.  The industry is continually beseiged with new standards which are intended to help.  Sometimes they do but mostly they don't.
Here is a run-down on historic shock sizes (now called "imperial") and the new (metric) shock sizes.

We used to have about 12 imperial shock sizes.  Now with metric we have an additional 5 frame sizes, 10 shock sizes and a huge number of custom strokes inside that.

Historic Imperial Sizes

Historically shock makers would make whatever frame makers wanted.  Eventually common sizes were settled on but never formalised.  Many of these shocks sizes were very tight for internal space.


Inch


Converted to mm


Notes


Manitou Availability


5.5 x 1.0 inch


140 x 25 mm


Obsolete


6.0 x 1.25 inch


152 x 32 mm


Old and uncommon


Mara Inline

6.5 x 1.5 inch


165 x 38 mm


Common XC size


 Inline


6.75 x 1.75 inch


171 x 44 mm


Specialized 2000 Bighit only


7.25 x 1.75 inch


184 x 44 mm


Specialized & Giant size


Use 190 x 50 mm
Mara Inline
with length reducing spacers


7.5 x 2.0 inch


190 x 50 mm


Common XC/trail bike size


Mara Inline


7.785 x 2.0 inch


200 x 50 mm


Can use a 200x56 with a stroke spacer


Use
200 x 56 mm
Mara Inline
with stroke reducing spacer


7.785 x 2.25 inch


200 x 56 mm


Common trail bike size


Mara Inline
Mara Pro


8.5 x 2.5 inch


216 x 63 mm


Common Enduro size


Mara Inline
Mara Pro


8.75 x 2.75 inch


222 x 68 mm


Common DH size, rare Enduro size


Mara Pro


9.0 x 3.0 inch


230 x 75 mm


Common DH size


9.5 x 3.5 inch


240 x 90 mm


Rare DH size, Scott Gambler etc

New Metric Sizes

In the mid 2010's the biggest shock makers all agreed on new frame sizes.  These have longer length for more internal room and feature standard length changes of 20 mm with 10 mm steps in stroke. 
Sounds great right?  But wait.
Now within each frame size they can have travel spacers to reduce stroke in 2.5 mm increments so bike makers can get exactly the travel the market segment desires. 
Also, each frame size and stroke can have two different head styles:
•   Eyelet heads use the same 1/2" DU bushings that imperial shocks used.
•   Trunnion heads make the shock 25 mm shorter and mount with bolts straight into the head of the shock using bearings in the frame.
Bearing options also exist for eyelet shocks.  These are all 30 mm wide and take 8 mm bolts.

Trek Example: A 230 x 57.5 mm shock is an eyelet shock in 230 x 65 mm frame with a 7.5 mm travel spacer inside.
Giant Example: A 185 x 52.5 mm shock is a trunnion shock in 185 x 55 mm frame with a 2.5 mm travel spacer inside.  Same internals as a 210 x 55 mm shock.


Frame
Size


Stroke Options*


Shock Size


Manitou Availability


Notes


35 mm
Max


30 to 35 mm


145 x 35 mm
Trunnion


Possible but we haven't seen one yet.


170 x 35 mm
Eyelet


Mara Inline
170 x 30 mm
170 x 35 mm


45 mm
Max



40 to 45 mm



165 x 45 mm
Trunnion


Mara Inline
165 x 40 mm
165 x 45 mm


190 x 45 mm
Eyelet


Mara Inline
190 x 40 mm
190 x 45 mm


55 mm
Max


50 to 55 mm


185 x 55 mm
Trunnion


Mara Inline or Mara Pro
185 x 50 mm
185 x 55 mm


210 x 55 mm
Eyelet


Mara Inline or Mara Pro
210 x 50 mm
210 x 55 mm


65 mm
Max


57.5 to 65 mm



205 x 65 mm
Trunnion


Mara Inline or Mara Pro
205 x 60 mm
205 x 65 mm





230 x 65 mm
Eyelet


Mara Inline or Mara Pro
230 x 60 mm
230 x 65 mm


230 x 65 mm
Trunnion


Mara Pro
230 x 60 mm
230 x 65 mm
for Trek Remedy & Slash


Trek Special for extra downtube clearance


75 mm
Max


70 to 75 mm

225 x 75 mm
Trunnion


Mara Pro
225 x 70 mm
225 x 75 mm


250 x 75 mm
Eyelet


Mara Pro
250 x 70 mm
250 x 75 mm

*Stroke is reduced from maximum using internal shaft spacers