Do any rear shocks from other bikes fit the mc21 i would like to adjust the rear ride height. I know the f3's were height adjustable but dont recall ever seeing one for sale. I would like one with the remote resevoir not piggyback.

I have a height adjustable Ohlins and it doesn't change it much. The problem seems to be the space needed to install the shock is short so the shock can only be a certain length to begin with.

I need more height and can't find a machine shop to make a shock linkage for less than a zillion dollars. I remember seeing something about a F3 linkage but good luck finding one of those.

MC21/28 never had an F3 linkage. The common one was for the '18.
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If I have to take the carbs off once more...

Oh ok, so it's not going to do a 21/28 owner any good.

Has anybody found another way to raise the rear of our bikes.

There's nothing to stop you making new linkage plates to increase the ride height, but it's not as simple as just drilling a few holes in a piece of sheet alloy.

I'm no suspension geometry expert, so someone else will need to do the calculations, but remember that the HRC plates for the MC18 not only raise the ride height, but also increase the spring rising rate.
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Andy.
NSR-WORLD.COM

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That's the problem.

I've made "dogbones" in the past for other bikes but the linkage on the NSR is not so simple.

The F3 shock can be lenthened by almost 12mm eye to eye over the stock shock. I would guess the Ohlins to be around the same. If that doesn't do what youre after not a lot will I fear.
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If I have to take the carbs off once more...

I wish I had measured it. But whatever it is, it's not enough. And I'm not talking some crazy rear ride height either.

There are quite a few 2nd hand ohlins shocks available from a few places that were fitted on cbr600's and fireblades etc from all different years. would any of them fit?

does anyone know what bike models are listed on the ohlins rear shock for the mc21. does the shock fit any other bikes?

You need a 46HRCL HO 014 as the other 46HRCLs have different adapters, spring length and spring hardness.
Ôhlins can deliver these parts but it will probably make a used one as expensive as a new. I gave up.
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

Was told by Ohlins rep that shocks HO0142 and HO206 are designed strictly for the NSR250.

machinerage wrote:Was told by Ohlins rep that shocks HO0142 and HO206 are designed strictly for the NSR250.

Could be correct as they have changed some numbers. I'm referring to the old numbers before the change.
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

Easy to make the MC21 link plates to give more ride height, but as The Grantster says, calculating so as not to change spring rate (too much) is a little trickier, but certainly not impossible.

By changing the shock length you are also changing the spring rate to a small degree as the suspension will be working through a different part of it's stroke.

The way to do it is to make an accurate CAD drawing of the swingarm, linkage, frame mounts (top of shock and 'dog bone') and shock and then plot the shock length through various degrees of stroke. You'll see that for each degree of movement through the swingarm stroke the shock compresses more each time (hence, rising rate).

Once you have the points you plot the non-linear graph, then try to replicate that as close as possible for the new (increased) ride height.

Now, let's not get too finicky here. If you have an adjustable for length shock the actual change in rate over the 10mm or so length change that you're likely to use is so small that you wouldn't notice it. Rossi might!

But......I've already made a CAD drawing thanks to this thread (couldn't resist it), just need to put the points in and I'll know where we are.

I don't need different plates as I have F3 shocks, and Paul has an Ohlins, but it is an interesting subject and I quite like the idea of some fancy looking plates to bling my bike some more.

Question for the wrecking crew: Who's using ride height adjustment, and how much extra length are you using?

You didn't mention the 28 Matt.