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Old 08-29-2015, 09:33 AM   #925
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which Centramatics?

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Originally Posted by switz View Post
Dill TPMS #1506-453 with #1900 display has six senders and receivers.

Centramatics 300-356 all "A" plates for the 16" wheels

McGard 24138 Chrome Cone Seat Wheel Locks and McGard 64010 Chrome Bulge Cone Seat Style Lug Nuts (1/2" - 20 Thread Size)
Lou,
Why a different Centramatics vs. the 200-221_Special that fits the 15"? Aren't most folks buying the 200-221_Special?
Thanks,
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Old 08-29-2015, 10:04 AM   #926
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The 300-356 appears in the catalog to be white or silver painted or bare metal.
The 200-221_Special seems to be darker or painted black.
I guess either will work, but I ordered the 200-221_Special for 6 lug Airstream trailers.
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Old 08-30-2015, 09:08 AM   #927
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The Centramatic 200-221 regular is for five lug nut wheels and will fit both 14" and 15" wheels.

The Centramatic 200-221 "special" was created for the Airstream 15" 6 lug nut wheels.

The Centramatic 300-356 "all "A" plates is larger in diameter with more balancing capability and only fits the 16" 6 lug nut wheels.

Note that all three sizes are $199 plus freight when ordered directly from Centramatic.
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Old 08-30-2015, 09:58 AM   #928
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Is it correct that the Centramatic 200-221 "specials" (that I have) can still be used if I change from 15" to 16" wheels?
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Old 08-30-2015, 10:15 AM   #929
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Yes. The 200-221_Special can be used with 16" wheels.
Would the 300-356 be better for 16" wheels because it is bigger?


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Old 08-30-2015, 10:41 AM   #930
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Yes, the 300-356 model would be better for the 16" wheels as it has more balancing mass.

While the new 16" tires and wheels are typically balanced on a machine, that extra balancing mass is even more important for the stock electric drum brakes as the drums are often not well balanced at the manufacturer.

Our retrofitted Kodiak disc brake rotors would have been balanced the factory.
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Old 08-30-2015, 11:29 AM   #931
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Should I cancel my order for the 200-221_Special and get the 300-356?


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Old 08-30-2015, 11:33 AM   #932
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I did the math some time ago, but as I recall, the centramatic spec call for them to become effective at 35 mph. If you take the rolling diameter difference (revs per mile) with the 200-221s and apply that to a 16", it makes about 2 mph higher effective starting point. Big deal? Not for me, since I already had the 200-221s on my 15"ers.
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Old 08-30-2015, 11:55 AM   #933
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Uh-huh-
So I am going 37 mph when the 200-221_Special become effective vs. 35 mph when the larger diameter 300-356 become effective?
I want them to be effective at 55-65 mph, and either the 200-222_Special or the 300-356 will do that.


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Old 08-30-2015, 01:37 PM   #934
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Quote:
Originally Posted by m.hony View Post
Uh-huh-
So I am going 37 mph when the 200-221_Special become effective vs. 35 mph when the larger diameter 300-356 become effective?
I want them to be effective at 55-65 mph, and either the 200-222_Special or the 300-356 will do that.


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Old 08-30-2015, 01:53 PM   #935
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Actually, I went and looked.

CMs are effective at 20 - 22 mph according to CM here:

Tire Balancers, Tire Balancing, Wheel Balancer and Wheel Balancing from Centramatic

My math says that the difference between GYMs (st225/75 r 15) Michelin LTX
(225/75 R16) at an assumed 21mph for 15s will be 21.8 mph for 16s.
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Old 08-30-2015, 04:24 PM   #936
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OK. The 200-221_Special is on the way.


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Old 08-30-2015, 04:47 PM   #937
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Last ride for these May-pops, too-
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Old 09-04-2015, 07:58 PM   #938
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If you have different diameter tires on a vehicle, it should not be driven very far or fast. It will be like walking with one short leg (or long one). On a trailer, since the axles are close together one smaller tire will cause the tire next to it to carry a lot more weight. And when towing, stability is very important, and with one smaller tire you'll have reduced stability.

But when we bought our second set of Michelin 16" tires, I did not change the spare. Maybe in a few years, or with a cheaper 16" tire. Since it is hard to wear out trailer tires before they age out, an identical spare and wheel are a poor investment. On a car or truck, tire need to be rotated frequently and I rotate the spare in with the others, thus getting more wear out of the tires. Trailer tires need rotation far less frequently. If I had thought this out originally, I would have bought a cheap steel 16" wheel and a cheap spare the same size as the Michelins—I would have saved $150 or so.

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