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Old 07-17-2013, 08:22 PM   #1
kb123 OP
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tires again, sorry

71 r75/5. what metric sizes replace old style numbers? nice simple tire and place to order. i like simple.

bridgestone, avon, continential or how about irc?
thoughts welcome.
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Old 07-17-2013, 09:34 PM   #2
supershaft
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Bridgestone S11's. 90/90 front and 110/90 rear.
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Old 07-17-2013, 10:21 PM   #3
carpetburn
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michelin pilot actives in the correct size
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Old 07-17-2013, 10:24 PM   #4
east high
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Dunlop K70s!
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'71 r75/5
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Old 07-17-2013, 11:04 PM   #5
Bill Harris
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Avon Roadrider tires are in "correct" inch sizes: 3.25-19 and 4.00-18 .

One metric conversion I've seen is 100/90=3.25-19 and 110/90=4.00-18 .

--Bill
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Old 07-18-2013, 12:26 AM   #6
Big Bamboo
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Yes! ^^^ Google those names and numbers and look for free shipping. +1 on the Bridgestones, great price, long wearing, sport / touring tire.
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Old 07-18-2013, 04:39 AM   #7
JonnyCash
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well, I just got a shinko something or other for the back of my Guzzi, in a 110/90-18, and it is a great tire, period. It just happened to cost $52. We'll see how it lasts. I think, but I'm not sure, that there is a 19" available for the front on an airhead.
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Old 07-18-2013, 06:52 AM   #8
Bill Harris
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Quote:
Originally Posted by Big Bamboo View Post
Yes! ^^^ Google those names and numbers and look for free shipping. +1 on the Bridgestones, great price, long wearing, sport / touring tire.
So are those Bridgestones the S11 or Battleax or what? I disremember.

Next "replace both tires cycle" I'm planning to try Bridgestone.

--Bill
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Old 07-18-2013, 07:18 AM   #9
Lomax
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Quote:
Originally Posted by Bill Harris View Post
Avon Roadrider tires are in "correct" inch sizes: 3.25-19 and 4.00-18 .

One metric conversion I've seen is 100/90=3.25-19 and 110/90=4.00-18 .

--Bill
+100

Marc
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Old 07-18-2013, 03:59 PM   #10
JonnyCash
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I had a set of BT45's on one of my bikes, and they rode great, but I won't buy them again. In 3500 miles, the back tire was not totally worn out, but it was pretty close. The front tire was cupping, but had lots of tread left. I just sold the bike, so I won't get to see how they finish off.Also, the sizing was very small. The rear, 110/90-18 looked about right, maybe a little small, but the front, 90/90-18 looked like it belonged on a moped. TINY! The last tire I bought to put on an airhead was a Michelin Pilot Activ for the front of my /5. It is a very nice tire, but a little expensive IMO. I really like the Shinko I got for the Guzzi, and it was super cheap. I like super cheap/great tires.
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Old 07-18-2013, 04:54 PM   #11
DaveBall
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The Bridgestones come in 2 different flavours.

SP11 Spitfire - pretty much equivelent to the standard OEM tire that came on the bike. Fairly long lasting if ridden normally.
or
BT45 Battleaxe - Shorter life span due to softer compound - for the more "spirited" riders.

Both are excellent tires. One thing you have to remember is that you need to run higher air pressure than what the original manual says. These are newer design and work best with a higher pressure. On my 81 R100RT I run 38 rear and 34 Front. You have to play with the pressures a bit to get it right for you and your riding style.

I have used both the BT45 and SP11 tires - not mixed though. I prefer the SP11 for my style of riding and find they do very well in both dry and wet conditions. Plus they tend to be a little cheaper.
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Old 07-18-2013, 06:23 PM   #12
Big Bamboo
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Quote:
Originally Posted by Bill Harris View Post
So are those Bridgestones the S11 or Battleax or what? I disremember.

Next "replace both tires cycle" I'm planning to try Bridgestone.

--Bill
Spitfires
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Old 07-19-2013, 06:46 AM   #13
kb123 OP
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thanks

went with pirelli's for size, cost and quick delivery from superstore.
advice always appreciated. will let folksknow how they do.
kb
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Old 07-25-2013, 11:22 AM   #14
darklight79
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Ordered a set of k70s for the r80/7 yesterday delivery tmmw install saturday. Woot woot superstore crazy fast
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Old 07-25-2013, 12:34 PM   #15
SculptD
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My recent tires have been: Spitfires, then Roadrunners, now PilotActivs.

Spitfires didn't follow rain grooves. Other than that, solid, but rather heavy and plodding. They wear well, but no fun for my taste.

The Roadrunners were the opposite. Eyeopening as to how much feel one could get out of early 70s airhead suspension. Truly modern as opposed to the spitfires. The are, however, a bit twitchy in certain circumstances. But I felt more confident at full lean than I ever have on this bike.

Pilot Activs seem in the middle. They are notably heavier than the Avons, and on the bike they feel it. But there is good sensitivity, and while they do follow grooves more that Spitfires, not as bad as the Avons. I'm also more confident in Michelin's quality control than Avon's.
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