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Old 09-18-2013, 07:31 PM
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Originally Posted by notsocrazybrit View Post
Guys I'm looking for some advice on gluing foam tire sidewalls.
In particular what type of CA do you use? Thick or Thin?
How do you apply it to get it even. Any secrets?
After the CA has been applied do you sand it smooth?
I don't use CA on rear tires. Weldwood contact cement is the magic stuff. It stays flexible when dry, which reduces chunking. I check the sidewalls after every run and add a little contact cement to any areas where the rubber starts peeling from the rim (between rubber and rim). 15 minutes later, she's ready to go.

I also add a layer of contact cement to the rear sidewall, let dry, then press the sidewall against some carpet to pick up fibers. This reinforces the sidewall while remaining flexible. Looks bad, but works good.
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Old 09-18-2013, 07:33 PM
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Originally Posted by dr_hfuhuhurr View Post
You're a NY area guy right? What compounds are you running, and where?
Last year I would run pink magenta fronts and pink magenta rears... This year many company's are changing to the new compounds coming out of Japan. For example ProOneRc will have b35 compounds for the rears and team purple fronts. This will set the be standard for carpet racing...I'm waiting for my order. Use to run at 360 and this season will be at Critters in NJ. Spent most of the summer running 1/8th off road. Can't wait to get back to carpet racing this winter
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Old 09-18-2013, 07:56 PM
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Originally Posted by howardcano View Post
I don't use CA on rear tires. Weldwood contact cement is the magic stuff. It stays flexible when dry, which reduces chunking. I check the sidewalls after every run and add a little contact cement to any areas where the rubber starts peeling from the rim (between rubber and rim). 15 minutes later, she's ready to go.

I also add a layer of contact cement to the rear sidewall, let dry, then press the sidewall against some carpet to pick up fibers. This reinforces the sidewall while remaining flexible. Looks bad, but works good.
That's interesting...I have been considering trying contact cement instead of CA. Thought I saw some black contact cement at one time but I haven't been able to find it again. Maybe add some dye or paint to the contact cement to make it look better.
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Old 09-18-2013, 09:31 PM
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Originally Posted by LloydLoar View Post
Honestly...running reasonably sized tires (41.5/42.5) I haven't glued sidewalls in ages. I found that when I glued sidewalls they would chunk really badly and it was even more maintenance. This is with many types of foam (synthetic, natural, weird new compounds) and both fronts and rears...

Probably the only thing I have had to glue recently are some of the Ultis come poorly glued from the factory, enough that you can lift the foam off of the rim, typically on the inside rear.
+1 on the poor glue job on the Ultis. Tough to stomach when 2 pairs of their $25 foam chunks WAY bad and then you notice that 80% around the rim 1/4" deep the foam is gone and you can still see machine marks in the rim where CA never made it except at the very very lip.
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Old 09-18-2013, 10:59 PM
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Originally Posted by InspGadgt View Post
That's interesting...I have been considering trying contact cement instead of CA. Thought I saw some black contact cement at one time but I haven't been able to find it again. Maybe add some dye or paint to the contact cement to make it look better.
I think it was called Seal cement used repairing wet suits. Hobbietat had it, don't know if they still do.
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Old 09-19-2013, 12:29 AM
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Originally Posted by avs View Post
i don't know if this is a typo but a 26/69 would give you at least 50mm rollout and close to 60mm with uncut tires. 71 is the smallest spur i have seen in 64pitch, so maybe you meant 48pitch?

26/96 was the suggested gearing to start, which is equal to 19/72 or 18/69 in 48pitch.

64pitch is common with indoor tracks where sand/pebbles are not an issue, 48pitch might be a better choice for outdoors
Sorry my bad 26/96 in 64 p should give me 32-35mm roll out?
lol so much to learn
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Old 09-19-2013, 05:03 AM
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Originally Posted by InspGadgt View Post
That's interesting...I have been considering trying contact cement instead of CA. Thought I saw some black contact cement at one time but I haven't been able to find it again. Maybe add some dye or paint to the contact cement to make it look better.
You'll find that this also improves handling on very high traction surfaces, where the inside wheels can occasionally lift off the track. The contact cement on the rear sidewalls has much better traction than CA, so when the car bicycles and the sidewalls contact the track, the car doesn't spin. Using CA on the front sidewalls does the opposite; when the car bicycles and the front sidewalls contact the track, they have very little traction, and the car plops back down on all fours.

But I still use contact cement to re-glue the fronts where the rubber starts peeling from the rim.

EDIT: Use the flammable Weldwood contact cement. The non-flammable (water-based) stuff doesn't stick too well. I'm not sure it even qualifies to be called "cement".

Originally Posted by RoyU View Post
I think it was called Seal cement used repairing wet suits. Hobbietat had it, don't know if they still do.
I like the idea of using Black Goo! I'll check out the local diving shop (since there are so many in Kansas). Or maybe I could add black Rit dye to the contact cement?

Last edited by howardcano; 09-19-2013 at 10:49 AM.
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Old 09-19-2013, 05:27 AM
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You can get black seal cement on amazon.com
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Old 09-19-2013, 06:46 AM
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Originally Posted by idbdoug View Post
You can get black seal cement on amazon.com
idbdoug
Thanks for the info, Doug!

It is much more expensive than Weldwood contact cement. The black seal cement is about $10 for 4 ounces, while Weldwood contact cement is $6.47 for 32 ounces at Walmart.

It still might be worth a shot.
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Old 09-19-2013, 05:41 PM
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Thanks for the input guys.
I think I'll have to try the contact cement on the rear tires just for a bit of chunk protection.
The CA advice I war looking for was really for front tires and traction roll prevention. As was mentioned small front tires under 42mm with a nice shoulder seems like the best way to go, but in extreme grip conditions CA seems to be the fix.
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Old 09-19-2013, 06:04 PM
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Can someone take a photo of a fresh set of tires with the proper amount of rounding that will reduce chunking?
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Old 09-19-2013, 06:09 PM
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Originally Posted by PROMODVETTE View Post
Can someone take a photo of a fresh set of tires with the proper amount of rounding that will reduce chunking?
rev8 with Ulti tires
41mm fr
43mm rr

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Old 09-19-2013, 06:14 PM
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Very nice!...... Super clean!
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Old 09-19-2013, 06:15 PM
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Battery cross ways...
What am I talking about, that's how I run mine. Is that your car RBF?
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Old 09-19-2013, 06:16 PM
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Excellent! Need to take a bit more off than I was. I come from slot cars so if I ever did any rounding at all it was 1/16-1/8 radius, so these big tires get a little scary!
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