7.5inch wide rims on Yeti?

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Don't suppose you know if putting 235/50 tyres on a 7.5in wide rim would affect the speedo? My inferior knowledge is that if the profile (the 50 part) is the same, the overall diameter will be the same. But I don't know for sure if that's right.

The aspect ratio or profile (in this case, 50) is expressed as a ratio that's derived from the tyre's section height / tyre's section width x 100.

So given the same aspect ratio, if you change the width, so will the height. This ultimately changes the overall diameter (OD).

For instance, a 225/50 R17 tyre has an OD of 658 mm and a 235/50 R17 tyre has a OD of 668 mm.

Fitting a tyre with a bigger OD will make the speedometer less overestimate the indicated speed. The wheel width does not noticeably affect the tyre's OD.

Increasing the wheel width by 0.5" and increasing the tyre width by 10 mm does not usually cause concern in most cars.

Yeah the standards are 225/50 as Rooboy points out. I guess my thought was that in getting a slightly wider rim, I wondered if I should get a slightly wider tyre to match.

No, it's not necessary. A 225/50 R17 tyre can be fitted on any wheel with a width of 6.0 to 8.0.