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Im not sure, I remember another thread talking about the 2018 Fatboy frame and 2018 slim frame difference (I believe they listed the specs) the 2018 slim won't except the 2018 Fatboy swing arm (different frame width) ? again, Im not sure though but with the Fatboy stock 240 rear wheel and slim 140 definitely a big difference.
To my understanding the 240mm bikes are different, the rest are the same. This is new territory for us..
I'm going to explore this with my local dealer further but the SG at first glance sure looks a lot like a Slim in the back with a different fender, struts and wheel. I like the fact that you kept it all factory parts!
My bet is that the struts from any Softail will bolt on to any other Softail frame...possible exception for the 240mm bikes. The 240mm bikes may have the same dimensions at the strut mount and simply a different swing arm, not sure on this new generation of Softail. If the new generation is like the previous then everything is the same with exception of the coating (matte or gloss) and the rake (neck angle).
You better have a good parts guy or tech to talk to about this and not just some monkey that never worked on anything in his life until he went to MMI. The guy who went to school won't have a clue, he will look it up and see a different part # not knowing the different # pertains to neck angle and coating. The guy who is a gearhead and has been there and done that will give you the proper answer.
I have a FXBB( Street Bob ) and a FXFBS ( Fat Bob ), both frames and swingarm looks exactly the same, the difference is in the struts. On de the FXFBS are they wider then on on the FXBB wich have the same fender
width as the Slim. I think it's going to be a weird sight if you install the Fat Bob fender and struts on the Slim. What I did on the Street Bob is a 4,5" rim with a 170 tire on it, that is the max you will get in the oem fender.
If you want to go wider then you better go with the fender from Rick's or even better with the one from Thunderbike like I did on my Breakout, it have integrated tail/brakelight and indicators and that gives it a much cleaner
look.
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