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Suggestion's for R69s tires
- schrader7032
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Re: Suggestion's for R69s tires
Your '66 model would have been before the taller rear end. The 4.00 is slightly wider so I suppose there are some "issues" with rolling the tire to the side. I thought usually that was more noticeable with front tires and the forces it takes to turn the bars versus the contact patch. The rears seem like they come along for the ride. The profile is symmetric which too means less of an impact with forces to lean over. For a metric tire, that's a different story.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- schrader7032
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Re: Suggestion's for R69s tires
The first bulletin (249) doesn't really say much yeah-nay about performance.jwonder wrote: ↑Tue Aug 16, 2022 5:39 pmKurt, I just read the service bulletins and it is very questionable on why they made the change. One bulletin says they are for sidecar and the other says it's for "higher speed". Read the bulletins below.
See:
https://vintagebmw.org/library_data/249.pdf
https://vintagebmw.org/library_data/261.pdf
https://vintagebmw.org/library_data/243.pdf
https://vintagebmw.org/library_data/267.pdf
Bulletin 261 speaks to 2-ply vs 4-ply.
Bulletin 243 just mentions the VIN change over.
Bulletin 267, the one I referenced, discusses the optimization of power and resistances to motion...yes, does mention higher speed issues. It also mentions an increase in ground adhesion...probably related to the bigger contact patch.
I guess if something feels better to you, then go for it. Most people don't have the ability to try a tire, go for a ride, come back and change to a new tire, and repeat the ride. I sure don't!
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Re: Suggestion's for R69s tires
S
- San Arthur
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Re: Suggestion's for R69s tires
Heidenau Vintage tires for me too.
Same size on both.
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
Re: Suggestion's for R69s tires
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Re: Suggestion's for R69s tires
Westwood, MA USA
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Re: Suggestion's for R69s tires
I echo 808Airhead and jeffrey
I tried Heidenau and Metzler on my r60/2. They look period, and are good for riding in a straight line around town.
But for anything else, a modern tire makes a world of difference.
I got two Avon Tire Roadrider MKII Front/Rear Tire (100/90-18 56V) for $128 each. It is like night and day. The bike is on rails.
Same tire, front and rear.
The 100/90 corresponds to 3.50
This size fits good, no rubbing of fenders, and easy to remove rear.
They make an H rated (130mph) and V rated (149mph), but it doesn't make a difference for our bikes.
- schrader7032
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Re: Suggestion's for R69s tires
Sort of! It is supposedly 100mm with which is close to 4.00 inches. Plus the tire is lower profile, ie 90% of the width represents the height. 3.50x18 tire is a "perfectly" round profile. YMMV!
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Re: Suggestion's for R69s tires
R69S - R60/2 - R67/2 - R51/3 - R69
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Re: Suggestion's for R69s tires
R69S - R60/2 - R67/2 - R51/3 - R69