if you keep the rolling diameter the same, you won't affect the speedo. you want a ratio of rim width to tire width to be .88 to 1.0 for predictable wheel/tire performance and sidewall behavior. more or less than that may be a safety issue.
__________________
Alan
1987 928 S4 (Black) SOLD!
1997 SVX LSi (Ebony) SOLD!
2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD!
1987 928 S4 (Black) SOLD!
2005 Forester XT Premium (Crystal Gray Metallic) SOLD!
2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+]
2015 Outlander Sport 2.4GT AWD (Mercury Gray)
2013 G37xS (Obsidian Black)
|