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  1. CapriRacer

    Bump Tube Form Standard

    I would call those flared fittings and I think there are SAE standards on them. Here's what Wikipedia says: "The most common flare fitting standards in use today are the 45° SAE flare[2] [3],the 37° JIC flare, and the 37° AN flare. So SAE, JIC, and AN standards.
  2. CapriRacer

    wheel time hole sizes

    Just so everyone understands, car manufacturers have hub piloted wheels - that is the center hub centers the wheel onto the hub. The lugs or lugnuts are there to clamp the wheel to the hub. I know of no exceptions. The hub is tapered and a "close" fit - that is there is a small amount of...
  3. CapriRacer

    Should I be worried about wheel load ratings?

    I think I answered this question on another website. I go by the name CapriRacer a lot, so this might be a repeat. Nevertheless, here is my understanding about wheel loading: There aren't any regulations about wheels being marked for max load and pressure. I've asked around a lot and the...
  4. CapriRacer

    Wheel load ratings and compatibility when considering non stock wheels.

    First, the US DOT doesn't require wheels to have specs written on them - unlike tires. Because of this, you need to be careful if they do publish specs. The wheel manufacturers aren't under the same scrutiny tire manufacturers are, so wheel manufacturers tend to make mistakes more often - in...
  5. CapriRacer

    RV's!

    3DDavwe said: "AFAIK the only people in the RV industry to ever truly suffer for their actions was Goodyear, who sold tires to it. They make a truck tire for low-range vehicles that works perfectly; got to move furniture or a bunch of lumber 20 miles? Great. They can do that until the rubber...
  6. CapriRacer

    Plysteer

    Anyone understand how plysteer affects vehicles? My questions: If plysteer is present in all tires, pushing to the left, and it compensates for the road crown, why isn't it a problem in places where they drive on the left side of the road, like the UK? What about on flat roads? Is plysteer...
  7. CapriRacer

    Two wheel drive vs 4 wheel drive (Torque, traction?)

    Unfortunately tires on a road surface don't follow conventional friction theory, so the physics is different.
  8. CapriRacer

    Two wheel drive vs 4 wheel drive (Torque, traction?)

    Thinking about this a bit further, the issue is the amount to torque being supplied to wheels. If the torque is capable of being throttled down to zero, then even at zero load, a tire on a road surface will have enough grip not to spin the wheels=- regardless of whether the truck is 2WD or 4WD...
  9. CapriRacer

    Two wheel drive vs 4 wheel drive (Torque, traction?)

    I am puzzled by your question. You talk about trucks, then mention planetarium. If we are talking about trucks on the road, you'll get one answer (roads have texture, and therefore grip from the tires). But if we are talking about smooth, untextured surfaces like a steel plate, then the...
  10. CapriRacer

    EV vehicles - solutions or junk ?

    Look, I'm not saying raising the cost of energy doesn't have its problems. But what are we supposed to do - sit back and complain? We're engineers. We're supposed to know how to fix problems. This is just a difficult one! With lots of side issues. So what if the government taxes energy and...
  11. CapriRacer

    EV vehicles - solutions or junk ?

    I think your premise is wrong. There are lots of batteries that last more than 2 years. But do I think EV's are the answer? No! I think the answer is reducing our energy consumption. I favor making energy consumption expensive! That way, people will start to think about how much they are...
  12. CapriRacer

    cushion forklift steer tire detached from integral rim

    I am going to guess you won't find anything that works. Forklifts generate a lot of torque and the bonding between rubber and steel isn't very good, so many times the steel is coated with brass or bronze. The copper in those adheres well to rubber. Let us know what happens. We could all learn...
  13. CapriRacer

    Off Center Boring of Automotive Wheels

    BrianE22, There are standard tire uniformity measuring machines - TUG machines (Tire Uniformity Grader). They operate at slow speeds. But tire uniformity behaves differently at high speeds. I'll bet that machine you declined to quote was a high speed machine as those are generally one-offs...
  14. CapriRacer

    Off Center Boring of Automotive Wheels

    First, thanks to all for the replies. I am especially grateful for the respectful tone everyone has taken. This could have devolved into name calling. My original question was "Do they still do this?" The response "They never did this." is a subset of "No!" OK I accept that. I was hoping I...
  15. CapriRacer

    Off Center Boring of Automotive Wheels

    Posted by pmbrunelle: "Were wheels produced with a single (nominal) dimension of runout (perhaps optimized for a certain statistical variation of tire uniformity), or were there different part numbers, with each part number having a slightly different runout dimension?" Here is my...
  16. CapriRacer

    Off Center Boring of Automotive Wheels

    Wow, so many responses! But clearly there are some misconceptions. First, I am a tire engineer - retired. At one point in my career, I interacted with Ford Light Truck Engineering in Dearborn. It was there that I learned about off-center boring. And perhaps off-center boring is a misnomer...
  17. CapriRacer

    Off Center Boring of Automotive Wheels

    Does anyone know if any vehicle manufacturer still requires their wheels to be bored off center in order to compensate for tire uniformity? BACKGROUND: Automotive wheels pilot on the center hole of the wheel rather than on the lugs. Some time back some vehicle manufacturers would have their...
  18. CapriRacer

    Slip and Axle Stiffness

    cibachrome, So you are saying that computer modeling of vehicles with trailers is something that is done - and for that, you need trailer tire data. OK, makes sense.
  19. CapriRacer

    Tire Engineers?

    Tire engineer here! I worked in design, testing, quality, and application. I agree with Greg. It doesn't seem to make sense. First, the writer is obviously not a native English speaker, so there may be some confusion in the translation. Second, there are things that just do not make...
  20. CapriRacer

    Slip and Axle Stiffness

    Greg Locock said: " ..... One that people don't think about is trailer tires. ...." OK, I gotta ask: Why? GEspo: That link took me to a discussion page. The tires in those photos look to me like cold tires driven hard. I've seen this before on some street performance tires driven on a track.

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