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Discussion summary
YOUR RESEARCHSpyder wheel for turbo (and C4S?)
Leading reported evidence
Use more
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Center locks admittedly are used more for the reduced tire-changing time in races though and less for the dynamic advantages I described.
Leading evidence: 'Use more' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace time in races though and less' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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That may be the case with aftermarket center-locks like these, but many race cars used splined wheels (Rudge knock-offs for early 356's were like this) so there is less weight off the center line.
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Suggestion
Center locks admittedly are used more for the reduced tire-changing time in races though and less for the dynamic advantages I described.
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Suggestion
Unfortunately they are bare magnesium so they won't stand up to street use without being painted.
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That may be the case with aftermarket center-locks like these, but many race cars used splined wheels (Rudge knock-offs for early 356's were like this) so there is less weight off the center line.
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I had a set of similar-appearing TSW 5-spoke wheels on my old '02 Passat wagon, lowered H&R + Bilsteins.
People were always tripping on those wheels, it wasn't easy to tell it was just a center cover plate with a large nut to hold the cap on....
Anyway I like that look, but yeah those wheels must be expensive.
Those are beautiful but these are actually much closer to what's on the Spyder. They are forged magnesium so they are very light and very strong. Unfortunately they are bare magnesium so they won't stand up to street use without being painted. The wheels were made by BBS a few years ago for the 996 supercup cars in Europe. Mine have both the five bolt pattern and the centerlock. They've been sitting in my garage for a couple of years. I plan to have them painted a dark grey and then I'll put them on my black cab.
The center-lock adapter that you bolt to the disc has nearly all its mass centered on the axle's axis and therefore (theoretically) doesn't require any force to rotate. With standard 5-bolt wheels, the power input to the axle has to overcome the "moment" of those bolts being Y distance from center axis ( Y x mass-bolt). Think about it in terms of swinging a ball on a string above your head; one end of the string is connected to a ball, one end is connected to a handle. The heavier the ball, the harder it will be to swing and keep swinging. But if you think about it, regardless of whether the handle is wood or steel, it wont effect how hard it is to swing the ball, that's because the handle weight is centered around the axis or rotation.
Actually center lock wheels have **** where the bolts usually are that go into holes in the back of the wheels. (I'll take pictures) With the turbo wheels it's those little red bolts in the picture. So, I think the force it exerted from the same point as if you have bolts. Clearly I'm not an engineer though.
That may be the case with aftermarket center-locks like these, but many race cars used splined wheels (Rudge knock-offs for early 356's were like this) so there is less weight off the center line. Additionally, those look like anodized aluminum which weight less than steel bolts. Center locks admittedly are used more for the reduced tire-changing time in races though and less for the dynamic advantages I described.
I think they're little paper weights that you can put on your desk and when people ask "What are those?" You can reply smuggly, "Race car parts" "oooooooouuu...."
Here is what they look like on the 997 cup. *** rather than splines. The splines would have to be pretty strong. There is a lot of torque here.
I'm not sure what the Spyder looks like but I can ask someone.
Tim,
Since this thread is about a close most of us are going to get to the turbo wheels, let's go with armor pericing slugs. That sounds like a lot more fun.
Jim
Actually, splined wheels usually have studs anyway so I guess its irrelevant. In those pics, the "studs" are aluminum and much smaller than steel bolts therefore much lighter.
Its always funny to me to think of the lengths to which engineers go to in reducing a race car's weight when the sum total of many itty-bitty weight savings can be negated by whether the driver had one or two bowls of cereal for breakfast. haha
