Tire size differences?

JimsCB160 · Posted: Wed Dec 14, 2011 8:47 am Post subject: Tire size differences?

Before I order tires... My Honda CB160 parts book calls for the front tire to be a 2.50X18 and the rear tire to be a 2.75X18. Would a 3.00X18 tire be OK to use? How much difference is there in the two sizes? The reason I ask is because I am not the 'thin' guy that normally rode the bike back in the 1960's ads. If you know what I mean. People back in those days were thinner... so, figure about 220lbs and maybe a passenger sometimes.

Is the 2.75 the height of the tire? It just seems kind of small. The front 2.50 tire needs to be small so it would fit inside the fender. Not a whole lot of room for any kind of expansion on the front tire, so I would probably get the 2.50X18 for that one.

Jim

dorT500 · Posted: Wed Dec 14, 2011 11:09 am Post subject:

http://vjmog.com/ftopic-7624-days0-orderasc-0.html

hahnda
Weekend Warrior

Joined: Oct 19, 2007
Posts: 47
Location: Wisconsin

Posted: Tue Nov 15, 2011 6:37 pm Post subject:

If you take a really close look at your rims you should find some letters and numbers. Those will probably give you the manufacturer of the rim and the size. The rim is narrower than the tire that gets installed on it. If you put tires that are to wide or to narrow for the rim width you change the geometry of the installed tire.

Found this chart online, it may be of some help.

18" Tyres Permitted Rim

250*18 1.40/1.60

275*18 1.40/1.60/1.85

300*18 1.60/1.85/2.15

360*18 1.85/2.15
80/100*18

325*18 1.85/2.15/2.50
350*18
375*18
410*18
90/90*18
100/80*18
100/90*18
100/100*18

460*18 2.15/2.50/2.75
110/100*18
120/80*18

400*18 2.15/2.50/2.75/3.00
450*18
110/80*18
110/90*18
120/90*18
120/100*18

510*18 2.50/2.75/3.00

130/80*18 2.50/2.75/3.00/3.50
130/90*18
140/80*18

130/60*18 3.00/3.50/4.00
130/70*18

140/60*18 3.50/4.00/4.50
140/70*18
150/60*18
150/70*18

160/60*18 4.00/4.50/5.00

19" Tyres Permitted Rim

275*19 1.40/1.60/1.85
70/90*19

300*19 1.60/1.85/2.15
360*19

325*19 1.85/2.15/2.50
350*19
410*19
90/90*19
90/100*19
100/90*19

110/90*19 2.15/2.50/2.75
120/90*19

JimsCB160 · Posted: Wed Dec 14, 2011 1:37 pm Post subject:

Thanks for that info and link!!! Very Happy

Jim

dorT500 · Posted: Wed Dec 14, 2011 1:39 pm Post subject:

hahnda · Posted: Wed Dec 14, 2011 10:16 pm Post subject:

Older tires were usually a 100% aspect ratio. So a 2.75x18 tire was 2.75 wide and 2.75" tall. So an 2.75x18 tire is "roughly" 2.75 + 2.75 + 18 = 23.5" in diameter. Modern tires can come in all sorts of ratios. 100/90-18, 150/70-17 etc. The first number is the width in MM and the second is the height as a percentage of width. So a 100/90-18 is 100mm wide and 90mm tall. A 150/70-17 is 150mm wide and 105mm tall.

A 3.00x18 will probably fit on your 160 as long as you have the clearance for the extra width. One other thing to keep in mind is that quite a few tires that you will find in these sizes might be scooter/moped tires. Make sure you have a look at the speed and load ratings of the tires you are buying.

JimsCB160 · Posted: Thu Dec 15, 2011 6:11 am Post subject:

Bikegeezer · Posted: Sat Dec 17, 2011 7:01 am Post subject:

No need to worry about scooter vs. motorcycle, because no company I'm aware of makes scooter tires any larger than 14" diameter. I'd recommend that you stick with the original sizes. Don't worry about having grown a lard a$$, just keep them inflated properly. As for speed rating, Bridgestone's tires to fit your bike have a 75mph rating on the front tire and a 94 mph rating for the rear. Your bike can't exceed either one, so not to worry.

Stu

Bridgestone AC01 front - size 2.50-18

Bridgestone RS10 rear 2.75-18

Or, you could mount their G510 on the rear for a 65 pound heavier weight rating. But the RS10 looks more "period correct".

Bridgestone G510 2.75-18

hahnda · Posted: Sat Dec 17, 2011 7:51 am Post subject:

Moped tires come 16, 17 and 18 inch sizes.

JimsCB160 · Posted: Sat Dec 17, 2011 1:17 pm Post subject:

dorT500 · Posted: Sat Dec 17, 2011 2:07 pm Post subject:

Whoa....mixing different brand tires front and back? That is not good. You never know what kind of handling problems that may cause. One brand rubber could be 'grippier' (softer) than another brand. Tire talk kinda puts me to sleep and I am no expert on tires but.....

Russell · Posted: Sat Dec 17, 2011 2:21 pm Post subject:

You'll not be pushing any limits of tyre capability with your bike ...those choices will likely work well together.Very very approximately I must have at least 500,000 km on a multitude of bikes behind me now.Many un-planned interactions with terra firma in that time. None of them could be attributed to tyres. For perhaps 60% of that distance the various bikes have worn different brands on each end,for a whole range of reasons. Some to do with the known capability of particular tyres and what I was using the bike for. Most to do with the state of our bank balance at the time. Sometimes simply because of what the bike shop close by had on the rack at the time. Go for it!

KirkN · Posted: Sat Dec 17, 2011 2:41 pm Post subject:

dorT500 · Posted: Sat Dec 17, 2011 2:47 pm Post subject:

JimsCB160 · Posted: Sun Dec 18, 2011 7:48 am Post subject:

Thanks for the points! I do appreciate them all too. I did try to find reasonably priced tires that were the same brand that had the same 'type' of treads as I showed. But that didn't work out too well. However, When you think of it, basically... how fast will I be going anyway with an old CB160 with a guy that goes 220? 40-45mph? HAHA This will be just the town rider for fun to bring back some memories of me riding it back in the early/mid 70's as shown in my avatar. At that time, I had a tire on the front that looks like a rear tire, and a knobby tire on the rear. Of course, I ONLY rode this in the trails. Wink

Never on the rode on the street, as I didn't ever have it tagged.

Jim