Had the new back tires mounted up today. Expected the tires to be bigger - looks like no difference in the total tread block to be applied to the road, just bigger grooves between the blocks. Tires are 40mm wider in theory, but looks like they just pick up 3/4" over the old 235/50-17 tires they replaced. The new backspacing on the rim is 1/2" more than the old rim, but with the slimmer tire bulge, they only extend 1/8" more back. I measured old and new tread depth to see how matched the two sets of front tires will be to the one set of rear tires. I've got 6/32 left on the old tires, and 10/32 on the new tires. There's half a chance I might wear out the two sets of front tires alongside the one set of rear tires.
Comparing the old (lower photo) and new (upper photo), you can see the deeper dish of the new back rims, and the greater groove size in the 275/40-17 tires.
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