 | Home > Wheels & Tyres > Dyna Beads |
 
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018   
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Do they have a finite life?
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2nd Apr 2019 12:27pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20365
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Iโd imagine the tyre lifetime. $W33T $0U7H3RN $UG4R
๐ฌ๐ง๐ด๓ ง๓ ข๓ ฅ๓ ฎ๓ ง๓ ฟ๐ด๓ ง๓ ข๓ ท๓ ฌ๓ ณ๓ ฟ๐ด๓ ง๓ ข๓ ณ๓ ฃ๓ ด๓ ฟ๐ฎ๐ช๐บ๐ธโฝ๏ธ๐ข๏ธโ๏ธ๐งฐ๐ช |
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2nd Apr 2019 5:46pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382 
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They should last much longer than the tyres, provided that they can be recovered from the tyres when the latter are replaced.
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3rd Apr 2019 12:06am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20365
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I canโt imagine many doing that though or accuracy being maintained with losses of beads in weight.
I had some complaining once at a tyre fitter โYou donโt have any of those dusty tyre beads in there or anything do you?โ. By the time you go though that they'd want to charge you too probably suggesting itโs a unique job. Pretty much by that stage Iโd have thought it practically pays to replace. That could be an opportunity to fit the larger standard beads in as well. But of course if anyone does their tyre change themselves if they are capable or would prefer to re-use then everyone has their own view and option to do so. I would have thought there would be contaminants in there and possibly dust too by that stage but Iโm no expert. $W33T $0U7H3RN $UG4R ๐ฌ๐ง๐ด๓ ง๓ ข๓ ฅ๓ ฎ๓ ง๓ ฟ๐ด๓ ง๓ ข๓ ท๓ ฌ๓ ณ๓ ฟ๐ด๓ ง๓ ข๓ ณ๓ ฃ๓ ด๓ ฟ๐ฎ๐ช๐บ๐ธโฝ๏ธ๐ข๏ธโ๏ธ๐งฐ๐ช |
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3rd Apr 2019 3:56pm |
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| CDN38 Member Since: 14 Nov 2014 Location: Courtenay, BC Posts: 729  
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I have been running balancing beads in my 285/75/16's for 3 years now. I'm very pleased with the result.
I am running Matt Lee's with the rolled edge, so the it's pretty much the only option other than the stick on weights which would only give a static balance. I think the beads are more equal to a dynamic balance. it's a Landrover thing... my renovation thread: http://www.defender2.net/forum/topic40792.html |
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3rd Apr 2019 4:05pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20365
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They are great, and yes as you mention dynamically balance instead of static which is good.
Stones in threads also throw balance off with static weights, usually until they are thrown off at great speed. $W33T $0U7H3RN $UG4R ๐ฌ๐ง๐ด๓ ง๓ ข๓ ฅ๓ ฎ๓ ง๓ ฟ๐ด๓ ง๓ ข๓ ท๓ ฌ๓ ณ๓ ฟ๐ด๓ ง๓ ข๓ ณ๓ ฃ๓ ด๓ ฟ๐ฎ๐ช๐บ๐ธโฝ๏ธ๐ข๏ธโ๏ธ๐งฐ๐ช |
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3rd Apr 2019 4:58pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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Why do you say stick on weights only give a static balance? |
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4th Apr 2019 7:00am |
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| ken Member Since: 18 Aug 2009 Location: Banging Birds with my bitches !! Posts: 4328
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Personally I only use proper weights I spend the right time and methods to get the right result if its good enough for F1 then its good enough for me
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4th Apr 2019 9:37am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382
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One very positive advantage of beads over weights is the fact that they are dynamic, so they readjust to the changing weight of the tyre as the tyre wears. With a road-biased tyre this probably isn't a significant factor since the wear will generally be even, but if, like me, you run mud tyres is is a huge advantage since it is very rare that MTs wear evenly.
In the days when I used fixed balance weights I would find that after 30k to 50k miles they would become almost completely ineffective due to tyre wear. Since changing the to beads, this doesn't happen (the only thing I have found was that I had to dump a load more beads into the tyres - I now have 500g in each 255/85 x 16 KM2, which is somewhat more than the bead manufacturer thought necessary). |
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4th Apr 2019 10:10am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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Interesting to read that many racing teams do not dynamically balance their tyres though? I found this an interesting read, especially regarding what dynamic balancing actually is ~ not just spinning tyre on a machine. http://rtstools.com/how-to-balance-your-ow...balancing/ I'm also wondering if beads can actually undertake dynamic balancing or are just very good at the static element, especially with a 4x4 tyre that can wear significantly on the outer tread. |
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4th Apr 2019 10:44am |
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| jonny Member Since: 10 Mar 2013 Location: North Wilts Posts: 149 |
I've got one of those bubble balancing setups - I've only used it a couple of times (not on Landy sized wheels) but it definitely works. It's a bit fiddly and takes a while but probably if I used it a few more times I'd be able to get quicker at using it
I think with a lot of kit garages have, a spinny balance machine is quick, fairly foolproof and looks impressive to customers. Likewise with wheel alignment rigs - a lot of race teams still use string and maths!! |
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4th Apr 2019 11:05am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382
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Did you read my post, immediately before yours? |
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4th Apr 2019 12:28pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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Blackwolf ~ yes I did
I was trying to comment on the fact that the beads may be dynamic, in the dictionary definition of that word, whilst not addressing the fact that they do not dynamically balance, or rather address the coupling imbalance that contributes to dynamic imbalance; instead beads just address the static imbalance element. The language of balancing seems a little perverse ~ maybe better to see static balance as the centrifugal balance. I found the pdf attachment to the previously linked Web page quite enlightening. |
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4th Apr 2019 2:55pm |
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| CDN38 Member Since: 14 Nov 2014 Location: Courtenay, BC Posts: 729
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In the case of Matt Lee rolled edge rims there is no "open lip" on the edge of the rim for clip on style weights, nor is there enough of flat surface for adhesive weights to sit. Therefore the only type of balancing would be to use the adhesive weights in the center of the rim, which is a static balance, or the balance beads.  Click image to enlarge it's a Landrover thing... my renovation thread: http://www.defender2.net/forum/topic40792.html |
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4th Apr 2019 3:50pm |
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