Bicycle Mechanics - rear wheel cog spacing

i am looking into getting a trainer sometime soon...
i dont own an old beater bike to put on the trainer, so i will have to use my road bike for the trainer and this is where my question comes from

i know that trainer are hard on tires and b/c of that i am thinking about getting a second rear wheel to have a cheapper tire on it for the trainer (and the same cassette size as my road bike)

my question is, are all 9speed shimano cogs going to be spaced the same distance so that all i will have to do is center the wheel and i am off, no dialling the derailler and i will be off and riding

i have a mavic kysrium elite with dura ace rear derailer with a 9speed 12-23T

i would be getting something like a 105 hub (or cheaper) with a 9speed hub with 12-23T

Yes the spacing is the same with all Shimano Cassettes.. and width of the wheels are the same 130mm. So you should have no problem just put it in and go.

Well... Yes gear spacing is the same that is true. The width is also 130mm... However I've noticed that different brands have different position/design of the free-hub body. The difference is usually quite small and can typically be adjusted using the barrel adjuster... This will get the center gears working right... However the top and bottom gears may be off and only the hi/low screws can be used to change this.

My advise is buy the same wheel, but for you that would be expensive. Perhaps staying with the same family... Like a lower end Mavic wheel... May reduce this...

If you do have problems then just turn the barrel adjuster and stay away from the top and bottom gears. You probably won't use them on a trainer anyway.

Just swap the tire, it is not hard and much cheaper than a new wheel.