yeah more tire questions

mitchberry · 09-13-2010, 12:40 AM

ok, i'm back with more tire questions...

Pretty simple one this time around... (learned a lot from the last 2 times i've bought tires)

the cb750 i have takes a

100/90-19 front

110/90-18 rear..

What's weird though is that those are the EXACT size my T500 takes... should be pretty cut and dry right...

well, the bike currently has bridgestone battlaxe tires (or whatever) on it, and my T500 has shinkos on it... side by side, the bridgestone tires appear to be smaller in height as well as width than the shinkos..

the rim itself also appears to be smaller than that of my T500...

i would really like a wider tire on the back of this bike... i know that the bike should take a 4" wide tire, and you can obviously go to 4.25 or 4.5 or whatever and it would be wide enough to still fit the rim safely, but....

when it comes to 110, 120, 130 etc, i don't know how that is measured...

what's the difference in width between a 110/90-18 and a 120/90-18?

if it's an inch, i don't think i can fit it comfortably on that rim. especially if it's smaller than my T500 (i have not measured it to verify.. ) i think i could easily fit a 5" tire under my T500 on the rim it has on it...

anyway, what are your thoughts? i don't have the physical measurements so it's hard to say.... i'll get those in a bit and update this... but assuming the rims are the same width could i put a 120/90-18 on it? or would it be so wide that the sidewalls would buckle around the rim and make it difficult to turn - keeping in mind that this is an INNER TUBE bike...

thoughts?

WintrSol · 09-13-2010, 08:47 AM

The number 110 is in millimeters, for a section width of 4.33 inches; the 120 is 10mm wider, or about 0.39 inches more. Section width doesn't (always) include the portion of the tread that wraps around the carcass, and some brands make the center of the tread thicker, too. Section width is NOT the rim size; tucking a wider tire onto a narrow rim will distort the tire, so that it may not even be wider when mounted, just distorted. The difference in tire design will account for the difference in sizes, even between tires made by the same company; often, you'll have to consider that when you have limited room for the tire.

rexmitchell · 09-13-2010, 10:27 AM

10 mm difference, but the above explanation is better than anything I can offer.

mitchberry · 09-13-2010, 10:39 PM

thx guys... makes perfect sense... i guess i'll just........ stick with stock.. makes more sense to do that than to experiment with unknowns...

WintrSol · 09-13-2010, 11:02 PM

Some tire makers have listings on their sites which will say which tires, in which sizes, are recommended or acceptable for your rims. You may want to pick a brand and see what they have to say.

09-13-2010, 12:40 AM	#1
mitchberry Powder Coating Service Austin Texas Join Date: Aug 2009 Location: http://redacesmoto.com Posts: 874	yeah more tire questions ok, i'm back with more tire questions... Pretty simple one this time around... (learned a lot from the last 2 times i've bought tires) the cb750 i have takes a 100/90-19 front 110/90-18 rear.. What's weird though is that those are the EXACT size my T500 takes... should be pretty cut and dry right... well, the bike currently has bridgestone battlaxe tires (or whatever) on it, and my T500 has shinkos on it... side by side, the bridgestone tires appear to be smaller in height as well as width than the shinkos.. the rim itself also appears to be smaller than that of my T500... i would really like a wider tire on the back of this bike... i know that the bike should take a 4" wide tire, and you can obviously go to 4.25 or 4.5 or whatever and it would be wide enough to still fit the rim safely, but.... when it comes to 110, 120, 130 etc, i don't know how that is measured... what's the difference in width between a 110/90-18 and a 120/90-18? if it's an inch, i don't think i can fit it comfortably on that rim. especially if it's smaller than my T500 (i have not measured it to verify.. ) i think i could easily fit a 5" tire under my T500 on the rim it has on it... anyway, what are your thoughts? i don't have the physical measurements so it's hard to say.... i'll get those in a bit and update this... but assuming the rims are the same width could i put a 120/90-18 on it? or would it be so wide that the sidewalls would buckle around the rim and make it difficult to turn - keeping in mind that this is an INNER TUBE bike... thoughts?

09-13-2010, 08:47 AM	#2
WintrSol Senior Member Join Date: Oct 2009 Location: Florissant, MO Posts: 2,564	The number 110 is in millimeters, for a section width of 4.33 inches; the 120 is 10mm wider, or about 0.39 inches more. Section width doesn't (always) include the portion of the tread that wraps around the carcass, and some brands make the center of the tread thicker, too. Section width is NOT the rim size; tucking a wider tire onto a narrow rim will distort the tire, so that it may not even be wider when mounted, just distorted. The difference in tire design will account for the difference in sizes, even between tires made by the same company; often, you'll have to consider that when you have limited room for the tire. __________________ '68-7? CB450 and '05 S50 Boulevard

09-13-2010, 10:27 AM	#3
rexmitchell Administrator Join Date: Jan 2008 Location: THE ATX Posts: 14,690	10 mm difference, but the above explanation is better than anything I can offer. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. You may all go to Hell, and I will go to Texas. - Davy Crockett

09-13-2010, 11:02 PM	#5
WintrSol Senior Member Join Date: Oct 2009 Location: Florissant, MO Posts: 2,564	Some tire makers have listings on their sites which will say which tires, in which sizes, are recommended or acceptable for your rims. You may want to pick a brand and see what they have to say. __________________ '68-7? CB450 and '05 S50 Boulevard

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09-13-2010, 10:39 PM	#4
mitchberry Powder Coating Service Austin Texas Join Date: Aug 2009 Location: http://redacesmoto.com Posts: 874	thx guys... makes perfect sense... i guess i'll just........ stick with stock.. makes more sense to do that than to experiment with unknowns...