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255/60 or 275/60 I can't decide #1655923 08/06/14 11:24 PM 08/06/14 11:24 PM
Joined: Jan 2003 Posts: 949 Indiana 6 68_661charger OP super stock
68_661charger OP super stock 6 Joined: Jan 2003 Posts: 949 Indiana	Its going on a b body 15x8 rim with 323 gears. Would I be able to tell a difference in performance between the two? Or is the difference in looks all im dealing with here?

Re: 255/60 or 275/60 I can't decide [Re: 68_661charger] #1655924 08/06/14 11:41 PM 08/06/14 11:41 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	The 255/60/15 looks like about a 27" tire and the 275 closer to 28". As far as performance, I guess it depends on what you are after. The shorter tire will sightly reduce overall gearing and (very) slightly improve acceleration. The wider 275's may (slightly) improve launch if you have plenty of HP. I think its mostly looks (and fit). I would think 275's would be tight in the rear and no go on the front. Measurements would need checked and backspace dialed in just right to fit the 275's if the sheetmetal and ride height are stock'ish. In general, either tire is on the tall side. With 3.23's the taller tires favor cruising vs acceleration unless you have a really big or boosted engine.

Re: 255/60 or 275/60 I can't decide [Re: ahy] #1655925 08/06/14 11:45 PM 08/06/14 11:45 PM
Joined: Jan 2003 Posts: 17,518 Las Vegas, NV 6bblgt I Live Here
6bblgt I Live Here Joined: Jan 2003 Posts: 17,518 Las Vegas, NV	which b-body?

Re: 255/60 or 275/60 I can't decide [Re: 6bblgt] #1655926 08/06/14 11:51 PM 08/06/14 11:51 PM
Joined: Jul 2003 Posts: 3,464 Back in NJ.... E EWJ master
EWJ master E Joined: Jul 2003 Posts: 3,464 Back in NJ....	I run 275s on a 69 B body on factory 15x8 rims with no clearance issues. Ed EastCoast Land Yacht Assoc. 1967 Newport Conv: 440/4 speed 1969 GTX: 440/4 speed, TX9/TX9, A34, N96 1970 Super Bee: 383/4 speed, B5/B7 1970 Coronet RT: 440/4 speed, A34, N96 1970 Coronet RT: 440/auto, A36, N96 1970 Road Runner convertible: 383/4 speed TX9/D6XW 1970 GTX: 440+6/727, A32, N96 2001 Dodge 2500 HO CTD, 6 speed, 4x4 quad cab long bed "The early bird may get the worm, but the 2nd mouse gets the cheese".

Re: 255/60 or 275/60 I can't decide [Re: EWJ] #1655927 08/06/14 11:59 PM 08/06/14 11:59 PM
Joined: Jan 2003 Posts: 949 Indiana 6 68_661charger OP super stock
68_661charger OP super stock 6 Joined: Jan 2003 Posts: 949 Indiana	68 Charger basically a stock 383

Re: 255/60 or 275/60 I can't decide [Re: 68_661charger] #1655928 08/07/14 12:31 AM 08/07/14 12:31 AM
Joined: Mar 2005 Posts: 3,145 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,145 Central NC	Go with the 255/60 although I usually run that on a 7" rim.On a stock 383 with 3.23 gears I would want the shorter tire myself.

Re: 255/60 or 275/60 I can't decide [Re: gch] #1655929 08/07/14 02:35 AM 08/07/14 02:35 AM
Joined: Jun 2004 Posts: 3,319 Chicago Burbs sthemi master
sthemi master Joined: Jun 2004 Posts: 3,319 Chicago Burbs	I love the 275 60 15s on an 8 in rim for my 68 Charger. Compared to modern cars, a 323 is a bit buzzy, the taller 275s help with that.. 8232570-PICT0150.jpg (114 downloads) Video Little Red Wagon Indy Nats,BurnoutContest

Re: 255/60 or 275/60 I can't decide [Re: sthemi] #1655930 08/07/14 11:36 AM 08/07/14 11:36 AM
Joined: Aug 2007 Posts: 6,096 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,096 Valencia, España	definitelly 255/60 With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: 255/60 or 275/60 I can't decide [Re: NachoRT74] #1655931 08/07/14 06:48 PM 08/07/14 06:48 PM
Joined: Jan 2004 Posts: 4,570 Motor City 6 6PKRTSE master
6PKRTSE master 6 Joined: Jan 2004 Posts: 4,570 Motor City	295/50's on the back of mine. I wanted the nice wide tire look but didn't want it sitting all jacked up from too tall of a tire. 8233022-IMAG0742.jpg (141 downloads) 1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.

Re: 255/60 or 275/60 I can't decide [Re: 6PKRTSE] #1655932 08/07/14 07:28 PM 08/07/14 07:28 PM
Joined: Jun 2006 Posts: 5,163 CT GTX MATT master
GTX MATT master Joined: Jun 2006 Posts: 5,163 CT	275 looks tougher, but with 3.23s and a 383 in front of it you likely won't be happy with how unresponsive it seems. Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street

Re: 255/60 or 275/60 I can't decide [Re: GTX MATT] #1655933 08/07/14 07:55 PM 08/07/14 07:55 PM
Joined: Nov 2007 Posts: 21,831 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,831 Kirkland, Washington	Get the tire you want, but dont be too concerned about gearing. The ONE inch height difference equates to 3.7% in gearing. In other words, if you had a 3.23 27" tire car to start with, installing a 28" tire would have the same effect as switching to a 3.35 gear ratio (if such a ratio existed). Or yet another way of looking at it, 3000rpm with a 27" would have to become 3111 rpm for the same MPH.

Re: 255/60 or 275/60 I can't decide [Re: 68_661charger] #1655934 08/07/14 08:44 PM 08/07/14 08:44 PM
Joined: Nov 2006 Posts: 1,459 oklahoma F forphorty pro stock
forphorty pro stock F Joined: Nov 2006 Posts: 1,459 oklahoma	275/60. Anything less will look small on a 68 charger.

Re: 255/60 or 275/60 I can't decide [Re: Pacnorthcuda] #1655935 08/08/14 12:51 AM 08/08/14 12:51 AM
Joined: Jun 2005 Posts: 5,107 Western Md. skicker "The Champ"
skicker "The Champ" Joined: Jun 2005 Posts: 5,107 Western Md.	Quote: Get the tire you want, but dont be too concerned about gearing. The ONE inch height difference equates to 3.7% in gearing. In other words, if you had a 3.23 27" tire car to start with, installing a 28" tire would have the same effect as switching to a 3.35 gear ratio (if such a ratio existed). Or yet another way of looking at it, 3000rpm with a 27" would have to become 3111 rpm for the same MPH. Can you explain the math behind this? As a common rule of thumb I've always figured 1" of tire to be about 6.5 points of gear. Your number is about double. ...FAFO...

Re: 255/60 or 275/60 I can't decide [Re: skicker] #1655936 08/08/14 01:02 AM 08/08/14 01:02 AM
Joined: Nov 2007 Posts: 21,831 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,831 Kirkland, Washington	27 x 3.14159 = 84.8" traveled. 28 x 3.14159 = 88.0" traveled 88.0/ 84.8 = 1.0377. Significant figures not paid attention to of course. 3.77 % difference.

Re: 255/60 or 275/60 I can't decide [Re: 68_661charger] #1655937 08/08/14 05:44 PM 08/08/14 05:44 PM
Joined: Jan 2003 Posts: 1,721 Eugene, OR F FuryBoy top fuel
FuryBoy top fuel F Joined: Jan 2003 Posts: 1,721 Eugene, OR	Have you looked at 255/70s? Great for road trips!

Re: 255/60 or 275/60 I can't decide [Re: FuryBoy] #1655938 08/08/14 07:11 PM 08/08/14 07:11 PM
Joined: Jul 2005 Posts: 11,632 SHELBY TWP,,MICHIGAN 72N96RR I LOVE WEDGIES
72N96RR I LOVE WEDGIES Joined: Jul 2005 Posts: 11,632 SHELBY TWP,,MICHIGAN	with no clearance issues with either on a 72 B body ive really liked either the 275-60/15 or the 295-50/15 both on a 8 inch wheel.. 1972 Road Runner / GTX 440 4spd Dana 3.54 Just about to turn 26K original miles.. A boat, a GMC truck, some Craftsman Tools, LOTS of Zombie Protection, and a few Goldfish.. If you love someone set them free.. If they come back it means nobody else wanted them either..!!

Re: 255/60 or 275/60 I can't decide [Re: 72N96RR] #1655939 08/08/14 11:33 PM 08/08/14 11:33 PM
Joined: Aug 2003 Posts: 8,828 Houston, Tx hemi68charger master
hemi68charger master Joined: Aug 2003 Posts: 8,828 Houston, Tx	One needs to consider if future tire rotation is going to happen. I like to have the ability to rotate my tires, can't do that if you have different size tires. I think, the best all-around, on 4-corners is 255/60/15's. If one goes to the 275's up front, you'll probably be rubbing the framerails. Now, if you could care less about being able to rotate tires, I did like the 275's on 15x8's on the rear of my former '69 Charger 500 and 255's up front on 15x7's ( Magnum 500's ) my Troy Houston Mopar Connection Club '69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)

Re: 255/60 or 275/60 I can't decide [Re: Pacnorthcuda] #1655940 08/09/14 10:45 PM 08/09/14 10:45 PM
Joined: Jan 2003 Posts: 5,275 near Harrisburg, Pa 4 440trk master
440trk master 4 Joined: Jan 2003 Posts: 5,275 near Harrisburg, Pa	Quote: Get the tire you want, but dont be too concerned about gearing. The ONE inch height difference equates to 3.7% in gearing. In other words, if you had a 3.23 27" tire car to start with, installing a 28" tire would have the same effect as switching to a 3.35 gear ratio (if such a ratio existed). Or yet another way of looking at it, 3000rpm with a 27" would have to become 3111 rpm for the same MPH. Your math is correct, but your application is backwards. A taller tire (28") would give you a ratio closer to 3.11 NOT 3.35 when compared to a 27" tire 3.23 ratio. Installing a taller tire is effectively like going with a numerically lower gear ratio.

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