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So looking at alternatives to a Cane Creek inline airshock, frame will run coil or air and has a shock length of 7.875 x 2.25 or 200 X 57, so I can get a coil shock in the length of 200 X 77.
Will that work? Or disaster of epic proportions?
You'll get increased travel at the rear wheel, possibly (probably) to the point that the wheel will hit the seat tube at full compression.
Fiery death obvs...
you'd have a LOT more travel. an extra 20 mm at the shock, so times that by the leverage ratio of the frame (normally between 2 and 3) and you'll find you have a wheel hitting seat tube amount of extra travel.
Are you sure it's a 200x77? Not really a common size..
Seller/ shop says 200 X 77 hence or presumably why mega cheap.
Frame is 155mm with 170 mm fork, so need no more travel.
Shirley you won't get extra travel you just wouldn't use the full stroke of the shock.
What bike is it?
Knolly warden
Shirley you won’t get extra travel you just wouldn’t use the full stroke of the shock.
by using the seat tube as a bump stop for the tyre? the 57/77 is the stroke length of the shock. i.e., how much it moves.
OP, what shock is it, a brief google isn't throwing anything up with those measurements, could be a typo?
Seat tube as bump stop is what would happen unless the bike has a foolish amount of clearance. Most full travel manoeuvres would be a bit disturbed by that I’d think.
Going a little bit longer isn’t necessarily a problem, but as above you need to have (stroke*leverage ratio) clearance to get away with it.
200x77 sounds like a misprint.
You get 155mm from 57, so 77 would give you 217mm roughly. That's definitely tyre hitting seat tube.
Fox Suspension DHX2 Factory Rear Shock 200X77MM , as stated nothing on Fox site....odd?
244x77 is possible.
200x77 sounds like nonsense.
Got this off the Knolly site:
[img] 
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That's roughly 200 X 57
I suspect the guy in the LBS is possibly measuring eye-eye and instead of measuring stroke he's measuring shaft length including eye.
Are you sure it's 77 not 57mm stroke?
the stack up of components in a shock that need to sit between the bushes does limit the amount of travel you can get out of it. a shock might be 200mm long but you lose some of that length to simply needing bushing mounts at either end, you need to accommodate the damper/shim stack a seal on the shaft a spring support (x2)... 77mm of travel would barely leave space to fit the bushes...
Must be a typo, that's way to much stroke for a spring in a shock that size, if it does somehow exist the frame might not allow it, tyre will probably hit the frame or saddle and the chainring will probably hit the ground when you bottom out.
Why is dirkpitt74 calling you Shirley.