Would 1.5 inch spacers be too much for stock wheels?

I suppose your lug nuts won't thread on.

 

what works for me & makes the wheels flush with the fenders (195/65r15 tires on 15 inch OEM rims):

front: Two WHEEL HUBCENTRIC SPACERS 5X100MM | 8MM THICK | 54.1MM CB
https://www.ebay.com/itm/172389065984?itmmeta=01HPW0JGRCK7P6QMX6731J0PNQ&itmprp=enc:AQAIAAAA8B5EuQ+V5u6JUSK85ziLZ1wsMn0fQJShiy5u/6JPiU3FJweEjoV0DdcWXV73CRI321nyexLrqean2cXJ9iWg9aEriEyMZ/jFAuUS6r/FTZNBhGlqXZ3GbufiJacymplqTGbSu01jlbfeMqi9jGpfEOTJkccXD4pb1n37Di0Alp0iT5tpByiqEq2BtDRQ7xw4KaJDkSTIlv2kSv9T18epkLOPXl7Lq7SdnFriM4C4KKr6WH1V81dQWmuxrpC2UwOFCpoRRKGKgckdi7RwxV01rPF7tfKtcWNF6NkPLCrPJqzprl7rK/T6s6Cv9MqwC90VjA==|tkp:Bk9SR6CMyoC3Yw

rear: ICHIBA Version 2 Hubcentric Wheel Spacers 25MM
https://www.ichibausa.com/ProductDetails.asp?ProductCode=WS-5510054C

 

Thick enough spacer will move the rim's hub hole completely beyond the hub, and reduce the engaged threads on the lug nut to wheel stud connections. That hub only projects out (beyond the usual surface the rim contacts) about 6 mm, at most?

Now you've got wheel restrained only by lug nuts, and reduced threads to boot.

 

It's mostly defined by quality/durability of hardware you're going to use. At 1.5 inches you're gonna need longer bolts to hold the wheel on. Sometimes when people do this they replace everything from bearings all the way out, which probably is smartest and most reliable way. But you gotta go down a pretty deep rabbit hole of precise measurements to find the parts that fit the best.

 

are you referring to lifting the car spacers or making your tires sit further away from your vehicle?

this is what a 2.0-inch spacer as a lift kit looks like on stock tires.





Personally, I think 1.5 is not enough...

So I went more than double 1.5...

https://black.jmyntrn.com/2022/05/13/my-toyota-prius-lift-kit-has-12-inches-of-ground-clearance/?utm_source=PriusChat&utm_medium=weblinkt&utm_campaign=commentlink