Rear shock sizing question ??

[Cb750stu]

Hi my Orbea wild has a 205 X 65 trunnion shock as standard , I've seen a coil shock that is 205 X 60 will the 5mm less affect anything , it's only 5mm so to me I can't see it would make much of a difference apart from 5mm less stroke ??

Regards Stuart

 

[StuR]

It will change your geometry a little, slackening your head and seat angle by approx 0.25 to 0.5 degree,
Lower your bottom bracket by about 5mm, shortern your rear travel by about 7mm depending on the leverage ratio of your suspension
The bike would sit a little lower
Imagine weighting your bike by sitting on it or pushing down on the saddle until the existing shock uses 5mm of stroke , that's how the bike would sit naturally when unweighted but a shorter stroke shock installed

 

[Mteam]

Hi my Orbea wild has a 205 X 65 trunnion shock as standard , I've seen a coil shock that is 205 X 60 will the 5mm less affect anything , it's only 5mm so to me I can't see it would make much of a difference apart from 5mm less stroke ??

Regards Stuart

Assuming the new shock is also a trunnion shock, all it'll do is reduce your rear travel by a few mm.

It wont change your static geometry, ie head angle ,bottom bracket height etc etc, I dont quite follow why the poster above thinks it will change all that when the eye to eye length is the same - maybe I'm missing something?!

 

[StuR]

Assuming the new shock is also a trunnion shock, all it'll do is reduce your rear travel by a few mm.

It wont change your static geometry, ie head angle ,bottom bracket height etc etc, I dont quite follow why the poster above thinks it will change all that when the eye to eye length is the same - maybe I'm missing something?!

Apologies , missed the eye to eye thingy
Brain fog just saw shorter shock and spewed out the above hollyhocks
You are correct, same eye to eye = no geometry changes but less stroke does = less travel
Sorry for confusion

 

[Jackware]

What's the current rear travel?

Say it's xxx mm, divide xxx/65 then times that answer by 60 to get the new rear travel mm

 

[slippery pete]

The shorter stroke shock is just restricted from reaching the full 65mm travel with an internal spacer. This can be removed to make it an exact replacement. Maybe ask a suspension expert for a price.

 

[Cb750stu]

What's the current rear travel?

Say it's xxx mm, divide xxx/65 then times that answer by 60 to get the new rear travel mm

Current rear travel is 160mm so with the above sum it comes out at 148mm ?

 

[Cb750stu]

Are the bottom eyelets on shocks a standard size ?? Just want to make sure that the pin that secures it to the linkage will fit ?

 

[Mteam]

Are the bottom eyelets on shocks a standard size ?? Just want to make sure that the pin that secures it to the linkage will fit ?

It varies by different shock brands and which shock you are looking at , some are the same others are not. And the orbea doesn't use any bushings at all on that mounting point, the bolt just sits directly in the shock eyelet, so you will need to ensure that the new shock eyelet is identical in size to the current shock.

Have a read of this for example - which is talking about cane creek shocks.

The Definitive Guide to Cane Creek Double Barrel Eyelets and Hardware | Mountain Bike Reviews Forum (mtbr.com)

you also need to ensure the eyelet of the shock you are going to use is the same width as the one you are removing.

I *think* fox uses the relatively standard 15mm eyelet diameter, and 12.7mm width, but you really should verify that this is correct

 

[Cb750stu]

It varies by different shock brands and which shock you are looking at , some are the same others are not. And the orbea doesn't use any bushings at all on that mounting point, the bolt just sits directly in the shock eyelet, so you will need to ensure that the new shock eyelet is identical in size to the current shock.

Have a read of this for example - which is talking about cane creek shocks.

The Definitive Guide to Cane Creek Double Barrel Eyelets and Hardware | Mountain Bike Reviews Forum (mtbr.com)

you also need to ensure the eyelet of the shock you are going to use is the same width as the one you are removing.

I *think* fox uses the relatively standard 15mm eyelet diameter, and 12.7mm width, but you really should verify that this is correct

Cheers thanks I'll get the shock owner to measure the eyelet and trunnion mount and I'll compare it with my standard shock ??