Tire Sizing? - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 14 (permalink) Old 04-28-2007, 07:34 PM Thread Starter
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Tire Sizing?

ok so i finally found a set of tires for my old a$$ bike and the thing is the smallest 19 inch tire is 110mm now the width of the front rim is 3.5 which equates to about 90 mm would that tire be too wide for it or would i be perfectly fine... i found a rear tire that is 120 and is closer to the rear tire being 4.5 inches wide or 118 mm... its the avon 45 or 46 and comes to about 200 for both of them off bikebandit.com. TIA for any info...
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post #2 of 14 (permalink) Old 04-28-2007, 08:03 PM
 
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on the rear, you should be ok. up front, I dont know.
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post #3 of 14 (permalink) Old 04-28-2007, 08:18 PM Thread Starter
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which is exactly why i was asking lol... i know it should stay as close as possible to the same size as the rim (at least thats how it is with car tires) but as for this whole bike thing i am truly a newb... well when it comes to the bike specific ****... and some things that could be the same as the car world might just be slightly different for a bike so im askin all questions on anything i am curious about....
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post #4 of 14 (permalink) Old 04-28-2007, 11:37 PM
 
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I assume this is for your 79 CB750. I use Metzeler Lazer Bias-ply tires on my 79 GS1000. Even though I have cast aluminum wheels, I have to use a tube in them. But no matter what anyone says, don't go looking at radials. This Metzeler website http://www.us.metzelermoto.com/en_85..._front=1530200 shows the 100/90-19M/CTL 57V LASERF (front) and 130/80V18M/CTL(66V) LASER (rear). That is if your rear tire is an 18-incher. You'll probably have to hunt around for these tires, but they are worth it. I'll post a picture of my chicken stripe tomorrow.
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post #5 of 14 (permalink) Old 04-29-2007, 12:50 AM Thread Starter
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yeah well i am still kinda curious about the tire sizing not really brand. and why shouldnt i go with a radial tire?????and the sizes for the rims is 19x3.5 front and 17x 4.5 rear so im thinkin in mm the 3.5 would be about 90 and the 4.5 is like 118 or somewhere around that...
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post #6 of 14 (permalink) Old 04-29-2007, 03:25 AM
 
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11o should be fine, i got the same size front rim, had the same width back rim too i believe. u can use a 90 series, 100 series, or 110. for the back a 130 is a good choice, or a 140 if you got the clearance. i got a 100 on the front of mine
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post #7 of 14 (permalink) Old 04-29-2007, 09:59 AM
 
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Originally Posted by DubLDN2O View Post
yeah well i am still kinda curious about the tire sizing not really brand. and why shouldnt i go with a radial tire?????and the sizes for the rims is 19x3.5 front and 17x 4.5 rear so im thinkin in mm the 3.5 would be about 90 and the 4.5 is like 118 or somewhere around that...

Radials and bias plys use different rim lip dimensions on the bead, and the rims, suspensions and geometry for radials are designed for a lower sidewall depth...using a radial on a rim designed for bias tires can result in clearance problems, wierd handling and tire bead catastrophic failure.

Sorry...you asked, we told ya.....
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post #8 of 14 (permalink) Old 04-29-2007, 10:52 AM
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Radials and bias plys use different rim lip dimensions on the bead, and the rims, suspensions and geometry for radials are designed for a lower sidewall depth...using a radial on a rim designed for bias tires can result in clearance problems, wierd handling and tire bead catastrophic failure.

Sorry...you asked, we told ya.....
But sometimes it works without a hitch...
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post #9 of 14 (permalink) Old 04-29-2007, 11:34 AM Thread Starter
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Quote:
Originally Posted by oldetymebiker View Post
Radials and bias plys use different rim lip dimensions on the bead, and the rims, suspensions and geometry for radials are designed for a lower sidewall depth...using a radial on a rim designed for bias tires can result in clearance problems, wierd handling and tire bead catastrophic failure.

Sorry...you asked, we told ya.....
ok well there isnt any reason to apologize i was just curious about it. theres always something someone can learn and you just learned me something haha.. ok so then the older rims are for sure bias ply style?
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post #10 of 14 (permalink) Old 04-29-2007, 11:38 AM
 
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Originally Posted by onesickpsycho View Post
But sometimes it works without a hitch...
Terrible gamble, though.

http://www.foreven.com/motorcycles/T...oshOnTires.htm




--------------------------------------------------------------------------------

RADIAL TIRES ON BIAS PLY WHEELS

From an Article Written by Tom Morrow, Vehicle Accident Investigator

...."Try losing your life with this problem! Rims for bias ply tires, radial ply tires, even disc brake rims are made out of different alloys. Rims for bias ply tires cannot use radials, and bias and simple radial ply rims cannot be interchangably. The forces exerted by bias vs. radial ply tires are different and need rims made for them.

In Mr. Oliverís case, he is using radial tires on bias ply rims. The rims over flex as they are unable to handle the forces of the radial tires. This over flexing also means metal fatigue, breakage (most commonly rim bead edge separation), and deadly accidents. Many will disagree, touting their successful usage of radial tires on bias ply rims, but as a fatal accident investigator, the first place I looked in any older vehicle accident was at the rims. "

How much is your life worth?
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post #11 of 14 (permalink) Old 04-29-2007, 11:53 AM
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You left out a quote though...

Mixing tires itself, whether mixing radials with bias ply or mixing brands or makes of tires with similar construction is a black art. The standing rule is "caveat emptor" -- the buyer beware. Some coimbinations on some bikes work quite well, others are ill advised if not outright dangerous.

I guess it's a matter of being the first to try it... Don't be the first, wait until others have done it many many many times successfully... Then try it.

Quote:
Originally Posted by oldetymebiker View Post
Terrible gamble, though.

http://www.foreven.com/motorcycles/T...oshOnTires.htm




--------------------------------------------------------------------------------

RADIAL TIRES ON BIAS PLY WHEELS

From an Article Written by Tom Morrow, Vehicle Accident Investigator

...."Try losing your life with this problem! Rims for bias ply tires, radial ply tires, even disc brake rims are made out of different alloys. Rims for bias ply tires cannot use radials, and bias and simple radial ply rims cannot be interchangably. The forces exerted by bias vs. radial ply tires are different and need rims made for them.

In Mr. Oliverís case, he is using radial tires on bias ply rims. The rims over flex as they are unable to handle the forces of the radial tires. This over flexing also means metal fatigue, breakage (most commonly rim bead edge separation), and deadly accidents. Many will disagree, touting their successful usage of radial tires on bias ply rims, but as a fatal accident investigator, the first place I looked in any older vehicle accident was at the rims. "

How much is your life worth?
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post #12 of 14 (permalink) Old 04-29-2007, 12:10 PM Thread Starter
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Quote:
Originally Posted by DubLDN2O View Post
ok well there isnt any reason to apologize i was just curious about it. theres always something someone can learn and you just learned me something haha.. ok so then the older rims are for sure bias ply style?
because if its not for sure what style tires it needs then i guess we will have to wait and find out... hopefully its radial as there are more choices for that correct???? well either way it goes at least i know something new....
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post #13 of 14 (permalink) Old 04-29-2007, 12:31 PM
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Originally Posted by DubLDN2O View Post
because if its not for sure what style tires it needs then i guess we will have to wait and find out... hopefully its radial as there are more choices for that correct???? well either way it goes at least i know something new....
Yeah, you'll have more options in radial... However you can still get some pretty nice bias ply's...
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post #14 of 14 (permalink) Old 04-29-2007, 01:18 PM Thread Starter
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yeah well i was on newenough.com and found some ****. total for the gear and tires and stands it came to like 1700 but that includes it is all fresh gear. and a couple icon things which like they say you pay for name brand.. oh well i like lookin fly so. but anyways back on topic so with bias you need to have a tube inside or is it for ride preference???? im sure if you had a tube inside it would ride a little softer well i dunno i so need some help lol... will it tell me what kind of tires i need when i get the clymers manual???
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