Front and rear sub frame is the same as a 107 so expect the same offsets and issues as on a 107. I would not go too large on a 114 for the same reason as on a 107, they'll ride horribly.
I agree that the ride was very bumpy on the side with the 17", and the ride was more acceptable on the side with the 16".
Yes. It does look like the fitment issues are the same:
1) inside barrier for 16" or smaller wheels: tierod ends. (107 could not bolt on 8x16 et34, and weights brushed boot with 5mm spacer). With clk lightweight 7x16 et37, they would not bolt on and lightly brushed wheel weight with 5mm spacer. Very similar, but I think the 107 actually provided a few mm more room on the inside front.
2) with a lowered 107, the wheel well top is the issue on the outside, but for most stock 107s, at least ones with spoilers (~1979+), the front wing is more commonly an issue. For example, these 245/45/17 on et11 rubbed the front spoiler on my 107, but the wheel well top on the w114.
3) you can fit more wheel on the outer edge of the 107 than you can on the w114 sedan. I didn't have to do anything to make the 245/45/17 on et11 fit my 280slc rear, but the car wouldn't even roll without rolling the rear fender on my sedan.
I don't know about the coupes. I will surely give a try on the coupe rears after I get at least one of them running.
I have to admit I'm slightly confused about the inside fit. I believe I recall someone with a w115 that ran 8x16 et21 bbs rs. I guess he must not have had weights on the in we lip. Otherwise, they'd probably be brushing the tierod boot like my clk wheels did with the 5mm spacer, effectively, 7x16 et32. 8x16 et19.3 should take the same backspace as 7x16 et32 (assuming all things are the same on both wheels).
Well. I think I've bored enough people with the numbers. I think I've got what I need to move forward. I'm thinking that a staggered set of 8x16 et11 and 7x16 et23 would be ideal, but a squared set of 8x16 et11 and 225/50/16 will work. I may roll some fenders as a precaution. It also looks like the front end will definitely have to come down on this sedan. But first I think I will address more critic issues.
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