Question about 2005 AJP PR4 125 Supermotard

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Radial tires and bias-ply tires

What’s the difference between radial tires and bias-ply tires?

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The main difference between radials and bias-ply tires lies in their construction. Tires aren’t just toroidal balloons they are reinforced with cords of steel or synthetic materials such as nylon or Aramid. In bias-ply tires the fibers are wrapped in an X pattern between the beads; in radial tires the fibers are wrapped perpendicular to the tread. Radial tires have more flexible sidewalls than bias-ply tires, and thus absorb road irregularities better and have a comparatively larger contact patch when leaned over. Because of the flexible nature of a radial, these offer higher mileage compared with a comparable bias-ply for a given rubber compound. Since they absorb small road irregularities better, they ride more comfortably and are less likely to be upset by groovy pavement. ,,,

Posted on Nov 10, 2008

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Is it better to criss-cross tyres or rotate same side front back when rotating?


There has been a lot of discussion for that over the last 3o or 40 years. Old type "bias" tires were recommended to criss-cross. I personally don't like to change the direction of rotation for radial tires, they wear very quickly for several months if you do that, so I keep them on the same side.

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Been a while since I messed with tires and nomenclature, but as I recall, the "R" just indicated that it was a radial tire. Not really necessary anymore, as bias ply tires are virtually non-existant in passenger car tire sizes. I wouldn't worry about the absence of the R on the new tires. I assume you're looking at tires at a tire shop or tire retailer of some sort... they should know what the deal is.

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Sterring Wanders


Hi Anthony, It would help to know what vehicle it is? You should have the vehicle alignment inspected and adjusted. If your alignment center is good and know what they are doing, they should be able to tell you if the vehicle has worn tie rod ends or ball joints. They should also be able to advise if the suspension bushes are worn and in the case of your vehicle having king pins, be in a position to advise of excessive wear and any need to replace. If radial ply and cross ply tyres are mixed, especially on an axle, the vehicle will wander very badly and become very dangerous. Radial and cross ply tyres must not be mixed. Regards John

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1 Answer

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1 Answer

Tires


The main difference between radials and bias-ply tires lies in their construction. Tires aren’t just toroidal balloons, they are reinforced with cords of steel or synthetic materials such as nylon or Aramid. In bias-ply tires, the fibers are wrapped in an X pattern between the beads; in radial tires, the fibers are wrapped perpendicular to the tread. Radial tires have more flexible sidewalls than bias-ply tires, and thus absorb road irregularities better and have a comparatively larger contact patch when leaned over. Because of the flexible nature of a radial, these offer higher mileage compared with a comparable bias-ply for a given rubber compound. Since they absorb small road irregularities better, they ride more comfortably and are less likely to be upset by groovy pavement. While radial tires perform better than bias tires, some older motorcycles can’t be fitted with radial tires because of differences in rim profiles. You probably won’t notice much of a difference anyway, so stick with boas tires if that’s what the motorcycle was designed for.

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1 Answer

Info


1. Frame. If you've owned K-bikes, you know that nothing flexes between the steering head and the swingarm pivot. Very stable. Not so on BMW airheads, with their double-cradle steel tube frames, which earned airheads (like the R90S) the nickname Gummikuh (rubber cow). 2. Brakes. The R90S has 70s-era brakes. Not so good by comparison to late 80s-early 90s K standards. Many of the Ks also have ABS. Not so the R90S. 3. Engine: K-bikes engines are liquid-cooled fuel injected, computer controlled, and exhaust catalyzed. The R90S, like other airheads, is carbureted and air-cooled. Stay out of traffic jams on the highways, or pull over and shut it off. 4. Tires: The post-90 K-R bikes models have radial tires. I've found the R90S, like the KRT/LT models, to feel somewhat tall with its bias ply tires. That said, several years back I bought an R100RS just to own one, and to understand the experience was. Didn't hold a candle to a KRS in terms of performance, but had a certain heritage-appeal.

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1 Answer

Radial calipers


and have found these. They are described as: .. designed to adapt forks having standard bottom configurations to facilitate the use of radial brake calipers. The kit is intended specifically for use with the Ohlins R&T forks and Ducati superbike models prior to the 749 and 999. So I take it they will fit. Then I've found some radial calipers from a 2007 S4R. Having done some searching of the forum I'm still very confused about fitment offests etc - and have seen one thread warning about using 65-100 something! Can anyone give me a quick answer - what would need to be done to make these fit, or what should I be looking for?,Radial caliper conversions cost a big chunk of change and in my humble opinion there are way cooler things you can spend money on for a base 748 like light wheels or good tires and a track day. Do you really need them? I personally don't see the need for radial calipers on a 748 even if you track your bike. Why not drop some cash on a good set of pads and a 19x20 radial master cylinder if its responsiveness and feel you're looking for? ________________,,,

Nov 10, 2008 | 2001 Ducati 748

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