Tire size
#1
Tire size
Can someone tell me the stock tire size on a 1965 Cutlass convertible. I looked in both the owners manual and the shop manual and can't find the size in either one. I am thinking it was either 750 x 14 or 775 x 14. At present it has bfg 205-70r14 but I think they somewhat smaller than original.
#2
I don't really know anything about this topic, but I did find a few online sources that indicate the standard equipment tire size was a 7.35x14. I didn't do an exhaustive search, but I also didn't find a source that lists a different standard equipment tire size.
#4
To expand on the above, the 7.35x14 was standard, but 7.75x14 was optionally available, per the SPECS booklet:
This table provides dimensional information:
The 7.35x14 had an OD of just under 26" and a section width of 7.3". As noted above, 205/75-14 is the closest available modern tire, though about 3/4" wider in section. The optional 7.75x14 had an OD of 26.7" and a 7.75" section width. 225/70-14 is the closest available modern tire; slightly smaller in OD and about an inch wider in section.
This table provides dimensional information:
The 7.35x14 had an OD of just under 26" and a section width of 7.3". As noted above, 205/75-14 is the closest available modern tire, though about 3/4" wider in section. The optional 7.75x14 had an OD of 26.7" and a 7.75" section width. 225/70-14 is the closest available modern tire; slightly smaller in OD and about an inch wider in section.
#5
Thanks for your help Joe & Hurst. and thanks for posting the list of standard equipment, very interesting. My 205/70R14's only have an effective diameter of 23 1/2" (11 3/4" center to floor) even though the diameter is listed as 25.3. I know my speedo reads about 10% or more fast.
#6
Thanks for your help Joe & Hurst. and thanks for posting the list of standard equipment, very interesting. My 205/70R14's only have an effective diameter of 23 1/2" (11 3/4" center to floor) even though the diameter is listed as 25.3. I know my speedo reads about 10% or more fast.
#7
I've got nearly new BFG Radial ta's that were put on shortly before I purchased the car, so I guess I'll stay with them for now. I do wish they were a couple of sizes bigger as rpm at 70mph is close to 3400rpm with my 3.23 gears.
#8
Yeah, between torque converter slippage and tire rolling radius effects, that's somewhat higher than the theoretical 3000 RPM at 70.
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