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Post by Dandy Dan on Jul 4, 2005 13:42:41 GMT -5
I've been doing some thinking about going to 12" rims to increase my gear ratio so that my engine isn't revving to almost 9K at top speed like it is now. I've heard that 130/70-12's are basically the same outer diamter as 130/90-10's so I am thinking 130/80-12's might be the ticket. Today I went to measure my stock tires and here's what I got (note, I used a soft ruler which is kinda crude so these #'s aren't that accurate):
130-90/10:
Tire Height: 3.75"
Tire Width: 4.25"
Rim Diamter: 11"
120/90-10
Tire Height: 3.5"
Tire Width: 4"
Rim Diameter: 11"
First, what's up with the rim diameters? Honda spec's them at 10" and they must be because my Boppers also say 10" and they fit perfect. Is the rim measured by where the tire lips sit?
Secondly, I thought in the number 130/90 the 130 was the width in millimeters and the 90 was the percent of the width that it is tall. Using that info the measurements should be 5.1" wide and 4.6" tall. Obviously this doesn't line up so how are tires measured?
Basically I'm just trying the figure out what the diameter is for my stock 130/90-10 vs. a 130/80-12 so I can compare gear ratios. So far I've got the diameter of the 130/90-10 is about 18.5" which gives it a circumference of about 58.125". If a 12" rim is exactly 2" bigger in diameter like it should be but a 130/80-12 is 11% less tall (80 is 89% of 90) that would give me a tire height of 3.34" for a total diameter of 19.7" which is a circumference of about 62" which is about 6-7% taller gearing. However a lot of my numbers are flawed so it'd be nice if someone can set me straight.
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Post by Dandy Dan on Jul 4, 2005 14:17:05 GMT -5
I've found some information such as this website: www.kgmotorcycletires.com/find_your_tire_size.htmIt says what the tires should measure but I've seen a few sites like this and they all list a 130/90 tire as 5", 5.1" (width/height) which is way off from what I measured (3.75", 4.25"). What gives??? Perhaps the height is off cuz the tire extends into the rim (which could be why our 10" rims measure 11") and perhaps the width is off cuz our rims are to narrow??? it seems unlikely the rim would drop it 1.5". |
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Post by Kami no Chiizu on Jul 4, 2005 19:02:10 GMT -5
I was thinking about a larger front wheel... but I like the way the stock wheel looks (I think I'm in the minority on that one)
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Post by chanito on Jul 4, 2005 19:44:56 GMT -5
Ok, let my try to explain the metric system of tire sizing, the rear tires on oue ruckus are 130/90-10, that means that 130 is the tire thickness "sidewall to sidewall", 90 is the tire sidewall hight from the wheel bead to the floor, and finally 10 is the size in "inches" of the diameter of the hole where the wheel goes, so when you measure your wheel you need to measure where the tire sits, sorry for the quality of the drawing, but here it goes  Hope this explain it better |
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Post by Dandy Dan on Jul 4, 2005 20:17:22 GMT -5
That sounds good but why do I get 4.25" (108mm) when I measure the rear tire width when it should be 130mm (5.1")? It could just be my measuring. I used a pretty crude system so I'll take a better measurement when I get home tonight.
Regardless a 130/90 should be 117mm tall, a 130/80 should be 104mm and a 130/70 should be 91mm
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bluesmokeracing
Ruckster
vote for me and all your wildest dreams will come true
Posts: 253
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Post by bluesmokeracing on Jul 4, 2005 21:04:19 GMT -5
well rim dia is measured from inner to inner, like if u had a tire off and measured how big the hole in the tire is. 117mm= 4.6 inches. measure the tire from the ground to the lip on the rim about 1/2 inch in where the lip of the tire seats. 4.6 inches. 130mm=5.1 inches. only measurement i see is straight across the tread. if u measure it with a flexible measurement it is about 6.5inches (arch) aspect ratio is the secont number, but apparantly is not measured from the edge of the rim. i have 110/70/12s on mine and they are a little smaller rolling diameter than the stock 130/90/10. theoretically, a 130/70/12 should me the same size as a 130/90/10. quick rule is up one inch rim size, down 10 aspect ratio with same width and should stay pretty close size-wise. just measured my 12's and they are right at 3 inches sidewall height if measured this way(77mm)(110x.70=77mm)hope this helps  |
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Post by Dandy Dan on Jul 4, 2005 21:44:56 GMT -5
When I measured the thread width I did measure straight across. When I said I had a flexible measure tool I just meant that it was hard to hold tightly so that it was accurate plus, given the curved nature of the tire, it is hard to 'eyeball' the max widths.
Wouldn't 110/70-12's be pretty small tires? Since the 70 means the percent of the width that it is tall, you should have a tire height of 77mm (3") plus a rim diameter of 12" for a total diameter of 18" which gives you a circumference of 56.7" which is quite a bit smaller than than a stock rims circ. of 60.5". Do you notice a difference?
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Post by jimthejet on Jul 5, 2005 23:59:42 GMT -5
8-)Dan, try this website for your dimensions www.powerdog.com/tiresize.cgi, it will give you diameters and circumferences that you need for your overall gearing. The tire industry measures their products in a weird way, and Bluesmokeracing is correct in that aspect. They use a lot of "nominal" measurements that apply at different inflation pressures. It is pretty well hopeless trying to physically measure one or compare brand A to brand B. It is best to go by their published specs, either the brand or industry, whichever is available. |
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Post by Dandy Dan on Jul 6, 2005 15:15:40 GMT -5
Thanks for all the help. First I need to figure out which 12" rims I like the best and if I can pony up the $$$. There are several nice models and price is a factor but ideally I'd like 12" dio rims in black. I've seen the dio's in black but never in 12" so that basically rules them out. My bike is gonna look so trick if I could complete my dream rear end of a POD filter, Yosh pipe and 12" black rims with 130/80 boppers. You can see a similar rear end here (w/o the boppers):  |
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Post by SqUiRmInAtOr/ Phred 501 on Jul 6, 2005 15:33:07 GMT -5
 WOW YOU GUYS ARE SMART I'm thinkin about slicks down the road. Anybody usin em??
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Post by Dandy Dan on Jul 6, 2005 16:07:36 GMT -5
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bluesmokeracing
Ruckster
vote for me and all your wildest dreams will come true
Posts: 253
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Post by bluesmokeracing on Jul 6, 2005 17:54:15 GMT -5
Wouldn't 110/70-12's be pretty small tires? Since the 70 means the percent of the width that it is tall, you should have a tire height of 77mm (3") plus a rim diameter of 12" for a total diameter of 18" which gives you a circumference of 56.7" which is quite a bit smaller than than a stock rims circ. of 60.5". Do you notice a difference? yeah, theyre definately smaller, and lighter ;D they accelerate a lot better and get to top speed faster. now granted the tires are round instead of the junk stock tires, cool street tread.  the tires are kenda k-114, they are grippy enough to let me drag center stand going left, and the pipe going right with several clicks of preload on the rear shock  i sure wouldnt try that with the stock tires. im thinking of getting a 120/70 and a 130/70 and trying them as well. i really need a tach or something cuz the motor really gets spinning going downhill the rear tire looks kinda funny cuz its so skinny,too. ok im ordering a new tire.right.now. |
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Post by wainair on Jul 20, 2005 21:37:32 GMT -5
Okay, Here's a side question. As you all know I'm slowly converting my Ruck to the dio fork set up. Well I noticed today, just before I was taking my rims in to get my rubber changed over, that there was a difference in the rims. The stock rim has a bead width of 3.00in and the Dio rim is 2.15. So the Dio's are narrower by .85in. Will this be a problem in mounting the stock rubber. I noticed Smacky went to Boppers when he changed over but when I checked all the tire sites none of them mention bead width. Personally I don't think it should be a problem but I wanted to touch base with the sage techies here at RC.  ;D |
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Post by Dandy Dan on Jul 21, 2005 13:31:02 GMT -5
not 100% but I think your tires will fit fine. They'll tell you for sure when you bring em in.
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Post by sharkynrk on Oct 4, 2005 13:40:07 GMT -5
for the record your 50RR sticker is the "edit profanity", where did you get it
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Post by ace1969 on Oct 4, 2005 15:08:35 GMT -5
you can get them on ebay.
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Post by Dandy Dan on Oct 4, 2005 17:10:08 GMT -5
Yeah the guy I got them off of was called advantage design and they were 5$ for 2 plus 1$ shipping roughly. If you type in 50RR, 49RR, pocket bike stickers etc. you'll find them. There's a thread on here called 'decals and body decoration' I think and you can see a few pics of the other colours etc they come in. I think they come in 2-3 color schemes plus you can get em 49RR or 50RR or Yamaha style and get .5R stickers.
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Post by sharkynrk on Oct 11, 2005 12:49:10 GMT -5
sweet
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Ruckimike
n00b Ruckster
you can outdumb more than you can outsmart
Posts: 12
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Post by Ruckimike on Mar 14, 2006 18:05:53 GMT -5
Man, Like I really like the looks of the rims, but does'nt this mean you have to convert to disc brake on the front? The more I keep adding up all this stuff for perfprmance and bling bling it seems like I'm buying a new Ruckus.
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Post by Dandy Dan on Mar 15, 2006 9:51:29 GMT -5
It depends on the rims. The rear wheels are always drum but the front wheels are usually disc. All the battlescooter rims are front disc. You can get drum brake versions though of some nice rims. Check out scootrsport.com for some pics.
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