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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Tire size question /cgi-bin/YaBB.pl?num=1429353280 Message started by Ernie on 04/18/15 at 03:34:40 |
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Title: Tire size question Post by Ernie on 04/18/15 at 03:34:40 Good morning. I have looked up in the tech section but maybe it just too early in the morning to make since of what it's telling me. So, does everyone use the 140/80-15 tire on the rear? Noticed on ebay that there are very few choices and the ones there have really high prices. Thanks |
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Title: Re: Tire size question Post by projectfj on 04/18/15 at 04:46:13 140/80-15 is the stock rear tire size. It is a weird size so a lot of people get a 140/90-15 when they need a new tire, that's what I did. Then again, there's a few different tire sizes that will fit, I can't remember off hand how big you can go before having to modify the swingarm. You can get a Shinko 712 for relatively cheap, but be sure to check that you or somebody local can put it on for you. A lot of places won't put a tire on if you don't buy it from them. Back to your question, it all depends on the person. Some stick with stock, some go up in size, some get a bigger wheel size, and some put knobbies on there. |
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Title: Re: Tire size question Post by Ernie on 04/18/15 at 05:10:13 Is there any downside to putting a 140/90-15 on ? clearance or handling ? I would mount it myself. |
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Title: Re: Tire size question Post by projectfj on 04/18/15 at 05:25:58 I only have 50 or so miles on mine, but it seems to handle just fine. I had no problem with clearance, but I don't know what the PO did to my motorcycle. I've heard if you hit a nice sized bump, you'll scrub. Somebody will come along after while who has had a 140/90-15 far longer than I have that can more accurately answer your question. |
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Title: Re: Tire size question Post by Kris01 on 04/18/15 at 07:32:16 140/90-15 should have been the stock size tire. It makes the speedometer read closer to actual. The 140/80-15 is a weird size and you won't find many tires in this size. A tire with a shorter sidewall (140/80-15) will handle better due to less flexing in the sidewall but with the 140/90-15 you won't be able to tell any difference in sidewall flexing. I have the 140/90-15 and love it. Cruising RPMs in top gear will drop ~200 RPMs so the bike is a little smoother on the highway. I have no complaints with the taller tire. No rubbing, no issues, nothing! |
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Title: Re: Tire size question Post by Ernie on 04/18/15 at 07:49:27 Thank you for the reply's. |
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Title: Re: Tire size question Post by Serowbot on 04/18/15 at 09:47:32 They shoulda' put a 140/90 on there when they made the bike... With all the potholes around here,.. the extra cushion from the added tire height is a blessing... |
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Title: Re: Tire size question Post by MnSpring on 04/18/15 at 11:30:31 Well, I chose the 130/90-15, Because: It was easier to find, and get a, ’set’, (front & rear) Measuring the, ‘140’, vs the, ‘150’, the, ‘150’, in a, ’90’, (Could, hit the inside of fender bolts) Different manufactures, have different, ‘actual’, withs of a, ‘140’, going, ’taller’, to a ’90’. Which, (Might) have, required changing the bolts inside the rear fender. So after putting on the 130/90 Found out: Changing the, ’80’ to a ’90’, made the speed meter read closer to my GPS. And changing the, ‘140’ to a '130’, it seemed just a bit ’nimbler’, (however that could be the result of new rubber, not, 7 year old rubber) But Lots of people put on 140/90, and have no problems. (Some), need to change out the ’nuts’, inside the rear fender, for, ‘button’, head ones. |
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Title: Re: Tire size question Post by Kris01 on 04/18/15 at 13:57:51 Be aware that tire sizing will affect your gearing. |
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Title: Re: Tire size question Post by jcstokes on 04/19/15 at 12:24:53 I'm quite happy with my 140/90 Michelin Commander, however a recent thread stated that some 140/90's add about 6lbs to the unsprung weight compared to a 130/90. Some advocated that the 130/90 might add to the bikes manouverabilty, others stated that the 140/90 might give greater straight line stability. |
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Title: Re: Tire size question Post by MnSpring on 04/19/15 at 17:15:42 3127302D35202D36420 wrote:
Potholes in AZ ? My Grampa always said: "Dem roads in AZ are so smooth the only bumps are the shadows of the telephone poles". |
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Title: Re: Tire size question Post by zipidachimp on 04/20/15 at 13:39:40 As the guy that weighed my tires, the 6 lbs increase is over the 140/80-15. If I were to do it over, I would go for the 130/90-15. More unsprung weight is not a good idea, but now I'm stuck. google 'unsprung weight' for an explanation. 8-) |
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Title: Re: Tire size question Post by Art Webb on 04/22/15 at 18:18:24 I went with 140/90, and got a little scraping, but I have bag supports on my bike, and i discovered the shocks were at the lowest setting (I'm a big guy) next time I'm going 130/90 for reference, my 80s touring bike (xs11) weighs 200lb more than a Savage, has 3x the power, and the stock tire is a 130/90, so a 130 is plenty of tire for a savage |
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Title: Re: Tire size question Post by Kris01 on 04/22/15 at 19:18:24 I think someone posted the old Norton Commando tire size as being a 110/??. 130 is plenty for a Savage. |
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Title: Re: Tire size question Post by KennyG on 04/22/15 at 20:45:17 My 1973 Norton Interstate had 4.10 X 19" tires front and rear. The tires were about 4" wide and the bike weighed about 430 LBS. Kenny G |
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Title: Re: Tire size question Post by Art Webb on 04/22/15 at 20:50:26 wonder what that corresponds to in metric sizing? online converter says 104.5 mm, so probably 100/90/13 would be the modern equivalent |
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Title: Re: Tire size question Post by Dave on 04/23/15 at 03:06:58 47545251434444260 wrote:
There are 25.4 mm in each inch.....so a 4.10 tire x 25.4 = 104.14 mm. You need to be a little bit cautious about making those kind of conversions - you need to check the allowable rim width. The tire sizes shown in inches may be made for a different rim width than the equivalent metric tire. It is also important to check the rim width that a particular tire is made for. Most 150 width tires are made for a 3.50 rim and are not recommended for use on our 2.75 rear rim. Mounting a 150 on that rim will make a really arched tread....you will wear out the center too soon, and never be able to use the tread that is wrapped over on the side as a result of the tire being squeezed by the narrow rim. I currently have a 90/90-18 tire on the front and a 110/80-18 rear tire on my Cafe' conversion.....and there is plenty of tire for the 30+ HP and torque. We currently are in a mindset of needing much wider tires than we really do......it's a visual thing induced by looking at custom cruisers and road racing 1,000cc superbikes......or 800 pound touring bikes. |
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Title: Re: Tire size question Post by Art Webb on 04/23/15 at 08:09:52 Thanks Dave,very good info, I bookmarked that chart :D |
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Title: Re: Tire size question Post by Dave on 04/23/15 at 08:29:58 It is a mistake I made on my first rear tire. I followed the herd and installed a 130/70-18 tire on the 18x2.50 rear rim. I wore out the center of the tread in 4,000 miles and there was tread wrapped over on the side of the tire I couldn't possible lean over far enough to use. A 130/70-18 tire belongs on a 18x3.50 rim. If you want a wider tire....you really need a wider rim to match. |
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Title: Re: Tire size question Post by Art Webb on 04/23/15 at 08:35:07 no way would I go wider, the S40 is over tired as it is, I will likely go narrower next time around In fact I wonder if the 140/90 may be negatively affecting steering |
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Title: Re: Tire size question Post by Gary_in_NJ on 04/23/15 at 09:42:12 5C676A7D6C607B7D666E637C0F0 wrote:
Also keep in mind that while modern sport bike tires use dual - or even triple - compounds (soft at the edge, hard in the center) to evenly distribute wear and improve handling at the limit; the tires available for for a stock S40 (15-inch rim) or even the cafe conversions (18-inch rim) are old-tech single compounds. Unless you spend a third of your time in left hand turns, a third in right hand turns and a third in straight-line cruising - you'll never get even wear on a single compound tire. The one advantage I can think of (if you like this characteristic) with a pinched tire is faster rotation from straight-up to leaned over due to the more rounded radius of the tire. This characteristic might be less desirable on an S40 then on a cafe racer. As I gain confidence on my cafe racer I notice the chicken strips on my rear getting smaller and smaller. |
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Title: Re: Tire size question Post by Dave on 04/23/15 at 09:53:57 I used the Pirelli Sport Demons for the first tire. Now I have BT45 Bridgestone Battlax that is supposed to be a dual compound tire on the rear (single compound on front). |
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Title: Re: Tire size question Post by Gary_in_NJ on 04/23/15 at 10:14:25 I was not aware of the Pirelli Sport Demons or the Bridgestone Battlax BT45. It's nice to know there are options besides the Kendra 671's I got from RYCA. Let us know what you think of the BT45's. |
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Title: Re: Tire size question Post by Dave on 04/23/15 at 10:24:12 Another option is the Avon Roadriders....they come in a bunch of sizes that fit older bikes. |
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