I have noticed that 17 inch Delta Alloy wheels by WSP are given as 17 x 7 whereas the standard Honda 17 inch wheels are 17 x 7.5J, thus are WSP wheels are slightly narrower which means less stability provided to tyres? My handbook states tyres for my 2.4EXi as 235/45R18 98W on 18 x 8J wheels but on 18 inch Delta Alloy wheels my car came with 225/45R18 91Y tyres. When I took these wheels off to clean them the size given is 18 x 7.5. In the Accord brochure the tyre size given for Accord 2.2 I-DTEC Type-S is 235/45R18 on 18 x 8J wheels. Thus if the optional Sigma Alloy wheels are 18 x 7.5, as the Delta Alloy wheels, then special 8J wide OEM wheels must be fitted to Type-S models assuming 7.5 inches is the same as 7.5J?