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Convert 9.5*3 to 230*65

1044 Views 14 Replies 8 Participants Last post by  bad mechanic
I bought a Manitou Mara Pro that was 230*60 and my bike uses a 230*65 shock. I went into the shock and removed a 5 mm spacer Manitou uses to shorten the shock length and I had my 230*65mm shock.

Using this same theory, can I convert a 9.5*3 (241.3*76.2) coil shock to 230*65 by simply adding a 11.3mm spacer on the shaft?

Am I missing something here or is it this simple?
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I bought a Manitou Mara Pro that was 230*60 and my bike uses a 230*65 shock. I went into the shock and removed a 5 mm spacer Manitou uses to shorten the shock length and I had my 230*65mm shock.

Using this same theory, can I convert a 9.5*3 (241.3*76.2) coil shock to 230*65 by simply adding a 11.3mm spacer on the shaft?

Am I missing something here or is it this simple?
No, that's not possible.

In metric-layouted shocks the eye-to-eye stays the same within a size bracket and you only change the travel, not the length.

With you 241mm you would need to change the overall length by 11mm and then also limit the travel to 65. So it would require two independent changes. Metric shock standards had been designed to work this way. Imperials are not.

Ride on

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No, that's not possible.

In metric-layouted shocks the eye-to-eye stays the same within a size bracket and you only change the travel, not the length.

With you 241mm you would need to change the overall length by 11mm and then also limit the travel to 65. So it would require two independent changes. Metric shock standards had been designed to work this way. Imperials are not.

Ride on

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Thanks for the response, I got excited there for a bit.
With you 241mm you would need to change the overall length by 11mm and then also limit the travel to 65.
But was that not just what would happen in the scenario jmvar described?

If he would open up the shock, and ad a 11,3 mm spacer inside the damper the damper could not extend fully, so eye to eye would be 11,2 mm shorter -> 241 mm - 11,3 mm = 229,8 mm. And because the damper cannot fully extend, the stroke would be 11,3 mm shorter as well, reducing the stroke to 65 mm.
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But was that not just what would happen in the scenario jmvar described?

If he would open up the shock, and ad a 11,3 mm spacer inside the damper the damper could not extend fully, so eye to eye would be 11,2 mm shorter -> 241 mm - 11,3 mm = 229,8 mm. And because the damper cannot fully extend, the stroke would be 11,3 mm shorter as well, reducing the stroke to 65 mm.
No. The spacer on the shaft is limiting the travel when you compress the shock. It can still fully extend to it's maximum length. Therefore it won't shorten the shocks eye to eye.

You need a spacer to also limit the eye to eye. This spacer belongs in the neg-chamber to stop the shock from fully extending.

This would give you a shock with 11mm shorter eye to eye and at the same time 11mm less stroke.

But here is another problem, since the aircan and it's volume / compression ratio is designed for 241length, you also alter that volume and might get less support or not enough progression out of the spring.

Since metric shocks has been designed this way, the aircans have all the same size. (Per eye to eye size).

So even if you are able the change the travel in some way it fits a metric spacing, you might end up with a weird spring.

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You need a spacer to also limit the eye to eye. This spacer belongs in the neg-chamber to stop the shock from fully extending.
Maybe I was unclear but this was what I meant by placing the spacer inside damper.
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I bought a Manitou Mara Pro that was 230*60 and my bike uses a 230*65 shock. I went into the shock and removed a 5 mm spacer Manitou uses to shorten the shock length and I had my 230*65mm shock.

Using this same theory, can I convert a 9.5*3 (241.3*76.2) coil shock to 230*65 by simply adding a 11.3mm spacer on the shaft?

Am I missing something here or is it this simple?
Yes you can. Spacer goes inside the damper on the coil shock.
Depends on what kind of coil shock.

On a Cane Creek Double Barrel coil-style shock, yes you can add a spacer under the main piston to get what you want (I've done it).

I'm no suspension enginerd, but on a shocks that have the rebound adjuster on the shaft eyelet (newer Fox DHX2, older Fox RC4/DHX5, Ohlins...pretty much every shock that isn't a twin-tube design like the CCDB), there's a small hole on the shaft near the piston. If that stays covered up with your spacer as the shaft moves, you will probably run into issues. Your spacer would have to be secured to the seal head of the shock so as the shock compresses, the spacer stays put and the shaft moves freely through it.
Yes you can. Spacer goes inside the damper on the coil shock.
Would I be able to do this on an older fox rc4?
Would I be able to do this on an older fox rc4?
Yes, but the spacer needs to be a close fit on the shaft to work with the hydraulic top-out that is created as the rebound port goes inside the cap bushing.

Basically the spacer needs to be precise for shaft fit and also tight fit in the bore so it doesn't float up and down.
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Depends on what kind of coil shock.

On a Cane Creek Double Barrel coil shock, yes you can add a spacer under the main piston to get what you want (I've done it).

I'm no suspension enginerd, but on a shock like the newer Fox DHX2 for example with the rebound adjustment on the shaft, not so simple.
On the new DHX2 it doesn't have a hole in the shaft.
On the new DHX2 it doesn't have a hole in the shaft.
You're right, I just checked the service manual for it. I guess I'm really not a suspension enginerd.
On the new DHX2 it doesn't have a hole in the shaft.
I know I'm resurrecting a long dead thread, but do you know which other coil shocks don't have a bleed port on their shaft for hydraulic top out?
cane creek shocks, marzocchi moto c2r
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cane creek shocks, marzocchi moto c2r
I also just learned the RS Vivid R2C is also like this.
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