I need bike part

[Jlisha]

26 inch rear wheel with double wall cassette for diamondback Sorrento.
Where can purchase ?

[Backmuirman]

Hi jlisha,

Main things you need to know for purchasing the correct wheel are: Width between the drop-outs (part of the frame that the wheel axle fits into), rim width (check your tyre sidewall for current size....you probably want a rim that can accommodate this tyre), brake type (probably rim as opposed to disc?) and number of cassette cogs (ie, how many gears at the back). Cassettes can vary in terms of gearing, so if you're happy with what you have, count the number of teeth on the smallest and biggest cog. 'Double wall' refers to the rim....these are a bit stronger usually.
Once you know this info you can buy these in all sorts of places, in-store or online. All the best.

[Flowrider]

Great advice @Backmuirman . Awesome to have that kinda info on the forum!

[Jesper]

Please excuse my ignorance, but what is a double wall cassette? Are you referring to a double wall rim? (Edit: already addressed!)

Do you have the old wheel as a reference to go by? If so, are you wanting to maintain the same gear sizes, or do want to customize your ratios? If you change cog sizes you may need a different derailleur so check what maximum cog size your derailleur can handle. It might also necessitate a new chain length depending on how much you change sizes by and again the capability of the derailleur.

[ReapThaWhirlwind]

If you just type most of that into Google, you'll find something possibly.

Getting just a single wheel can be troublesome, don't get easily discouraged.

Don't forget rim brake or disc brake when you search it.