 | Home > Wheels & Tyres > Dynabeads in rear tyres? |
 
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039   
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I use a different brand and it is more a powder then small balls but the principle is the same.
I saw 2 things mentioned I like to react on: 1. The way the dynamic balancing works. I can not explain in detail but the dgeads will not evenly spread in the tyre. The will kepp moving. A tyre on a car does not rotates nicely like on a wheel balancing machine. Just think about it. Say you are driving 50 mph. How fast is the btm side off your tyre moving and what about the top side off your tyre? Yes 0 mph on the btm and 100 mph on the top so the beads will be thrown around in your tyre. Because off this movement the sysstem works. Balancing on a machine with beads in the tyre will not work as the beads will spread themselves it the tyre and probably on the wrong spot. 2. Moisture or water in the tyre might make some beads to stick to the tyre for a while till they are kicked loose by the other beads so could cause some inbalance for a while. Roel 1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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15th Oct 2019 8:07am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16867  
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This is an interesting point. The movement of a single point on a tyre in a single plane is a form of simple harmonic motion, but the movement of free-moving beads inside the tyre is potentially very complex since the forces working on a single bead will consist of the acceleration cause by the forward movement of the vehicle coupled with the SHM, the forces of gravity in the vertical plane, any accelerations due to imbalance of the tyres, any accelerations due to road surface imperfects, combined with the centripetal force from the tyre on the bead. Onve upon a time I could probably have produced a sensible mathematical analysis of this, but now the overall result of this is far, far beyond the processing capacity of my brain so I will just put it done to magic! It does undoubtedly work however, and beads are great! |
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15th Oct 2019 8:54am |
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| CarMan Member Since: 29 Nov 2010 Location: Cotswolds Posts: 1777
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Are they only available from here https://www.dynabeads.co.uk/index.php
Seem quite expensive as previously said compared to Devon 4x4 but I want to put them in via the valve are you can't do that with theirs  Rob
1993 200tdi 90 hard-top 1998 300tdi 90 soft-top 2016 2.2 XS 90 hard-top |
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10th Jun 2020 8:30am |
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| donmacn Member Since: 07 Nov 2017 Location: Nth Scotland Posts: 1829 |
Carman - I know I posted this somewhere, but it's not in this thread.
With these small beads, just consider them whenever you go to put air into your tires. Once upon a time, when I had these fitted, I went to a garage air station. Took the cap off the valve, put the hose on to check the pressure, and when I took it off, the little escape of gas was enough to lift one of the small beads up into the valve.... hissss... and nothing I could do but watch as all the air drained out of the wheel. I can't remember if I tried to blow the grit out when the tyre was empty and that didn't work, but I probably didn't have a spare valve and key handy, so ended up changing to the spare wheel. Those beads were binned when the tyres were next changed. I had the valve at the bottom of the wheel when this happened - i.e. closer to the beads then resting at the bottom. Perhaps this was just a freak event, or perhaps something as simple as having the valve at the top would have avoided this? If I try them again, and I think I will, I'll be going for the larger ones that go in at the point the tyre gets fitted. Like I say, it could have been a freak 'one off' but it did happen. Donald 1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong (The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html ) 2000 Range Rover P38 4.0L V8 in the past.. RR classic - fitted with 200Tdi 1984 RR classic - V8 with ZF auto box 1993 Discovery 300Tdi not to mention the minis and the Type 2 VW camper... |
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10th Jun 2020 9:45am |
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| CarMan Member Since: 29 Nov 2010 Location: Cotswolds Posts: 1777
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Thanks, can't be worrying about that so decision made - weights it is, stick-on inside hopefully
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10th Jun 2020 9:53am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19557
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I have Dynabeads, never had any problem with them. Diesel$ Live$ Matter. β½οΈπ’οΈπ¨βπ§π§°βοΈ RED, WHITE & BOOST! π¬π§
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10th Jun 2020 12:54pm |
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| Grouse Member Since: 16 Apr 2012 Location: on the hill Posts: 512 |
Ditto, highly recommend them - seems to be that the larger beads put in through the tyre bead / rim edge are better 2017 Range Rover L405 Vogue SE V8 Diesel #16
Land Rover 110 300 TDI |
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10th Jun 2020 5:29pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19557
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Mine were put in via the valve stem so the standard size, so thatβs positive for both types.
Diesel$ Live$ Matter. β½οΈπ’οΈπ¨βπ§π§°βοΈ RED, WHITE & BOOST! π¬π§ |
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10th Jun 2020 5:56pm |
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| Badger110 Member Since: 06 Feb 2018 Location: South hams Posts: 1025 
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Today i learnt people put beads in their tyres
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10th Jun 2020 6:00pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16867
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I ran the small beads in my last BFG KM2s and they were fantastic, especially since as the tyres wear the beads simply keep on doing their thing. I have never had the bead-in-valve problem mentioned above, and if I did I would try just blowing air in to clear the valve. You need a lot of beads for 255/85 x 16 KM2s though, I think in the end I had 12oz in each tyre.
I haven't (yet) put beads in my current KM3s since (a) they are new enough to mean that they are in balance anyway, and (b) because the tyre fitter had so much trouble getting them on my Blindos that they were awash with bead lubricant by the time he'd finished, so much so that I expected them to slosh as I drove off! I rather suspect that any beads put in straight away would form a cement-like paste rather than remain beady, and I just hope that by the time beads are needed the lubricant will have dried out somewhat. |
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10th Jun 2020 6:06pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19557
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They had plenty of trouble setting the bead on my KM2βs as well, in the end they used a ratchet strap to help and it took ages. The chap that did it really worked that day. I can only but assume itβs storage methods causing this? I didnβt have any issue with 235 but the 255βs were like this but maybe due to different factors. Diesel$ Live$ Matter. β½οΈπ’οΈπ¨βπ§π§°βοΈ RED, WHITE & BOOST! π¬π§
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10th Jun 2020 6:39pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16867
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In the case of mine the main challenge seemed to be the Blindos' very narrow and fairly shallow well for bead to drop in to allow the opposite edge to cross the rim. It had about 6 tyre fitters providing"advice" to the one who was working in the end!
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10th Jun 2020 8:56pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19557
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At least they didnβt try the explosive bead setting manoeuvre.
π€£ Diesel$ Live$ Matter. β½οΈπ’οΈπ¨βπ§π§°βοΈ RED, WHITE & BOOST! π¬π§ |
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10th Jun 2020 9:04pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16867
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The problem was getting the carcase onto the rim, not seating the bead afterwards. The latter is easy on Blindos on account of the narrow well.
We came close to the explosive tyre fitters! |
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10th Jun 2020 9:09pm |
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