heh i noticed it too, the casual dishonesty - which will inevitably lead to them being fired for being racist/fascist **achem**s within the decade. MEANWHILE: Real people in other channels are drive-testing ELECTRIC cars, which don't sound like a bus full of chav kids farting their entire way to school 🤷🏼♀. edit: nah that seems overly harsh, lets see what these people are *really like.*
I imagine discussing engineering side of this solution: - Are you sure this scrub radius won't make this car undriveable in everyday commute? - What's a scrub radius?
So if the dual tire setup actually was half a second faster than original wheels then you should try with a very wide "single" wheel setup as well and see how the time on that track compares.
Most vehicles that use double wheels/tires only use them on the back axle. That would probably remove most of the steering issue, and much of the wobble. Still impracticle probably, and prone to damage, but worth a try if this was a serious idea rather than a funny video.
The search for the perfect combination of tire performance and safety is truly some of the most important work being done on the internet today. Also keeps me laughing my fool head off. Please continue the great work!
glad you guys are getting it in English, we've had 2 blokes all over the french youtube for a while now ("Vilebrequin" they're called) and I think they're even better than Top Gear ahah
For normal street cars, not large commercial vehicles or "Dually" trucks, multiple tries has been looked at, experimented with, and occasionally made custom for one-off show cars. The idea was to have tires that gave a LOT more channeling for water on the road, differing treads could be stacked for varying road conditions, and it was harder to be stranded or otherwise stopped with a flat. It is still doable but the cost of it may be more prohibitive than going with top performance tires. Still it is a good idea.
Honestly, I think you guys may be the only suitable replacement for Clarkson, Hammond, and May. Not that I want them replaced, but for when that unfortunate time comes. You guys have that perfect amount of comedic bickering.
We used to put double wheels on to reduce compaction on our tractors when going on the fields but that isn’t a issue on the road. Double wheels also puts huge strain on the drive shafts. Now we have given up with double wheels and just put 1 extra wide wheel on
One step further is tracks or half tracks. Like on the case row tracks and quadtracks. More surface area, and less rips up the ground a little when turning. At least on the bigger ones. Honestly I haven’t seen any difference driving them between tracks and wheels, but driving on triples hurts my soul
"Double up on tyres, double up on grip" 😆 This probably wouldn't have been such a disaster if you'd only done the rear (and if you'd done a propper twin rim setup where the tyres don't rub each other)... but putting twin tyres on the front... there's a reason this is just not done. From the camber and toe causing ungodly tire wear to the steering kinematic just being completely fudged. Fun to watch tho. Suggestion for another video: Tuners always go with harder and lower shocks to look track ready. What if you were to take this to the extreme, fitting solid shocks to that caterham? (It'll obviously be a disaster, but would be entertaining and show just how important a good suspension is, could be right up your alley)
Search youtube for MasterMilo Steel tube suspension TEST (no suspension at all). From same channel "Driving without shock absorbers" is also quality entertainment.
Do variable ratio tire. Cute the 17" tire and 20" tire in half combine these tire. The 20" outside bead 17" inside tire. Do this to all four tires. You could retain the soft ride with the 17" and use the 20" for aggressive turning. Good luck
I don't think that would work like you think it will since all 8 tire should always be in contact with the ground. It will only flex as much as the 20 in tires and really with both the 17 and 20 it would probably be stiffer since each tire is handling less weight.
Tire is a variable ratio tire. That means we are making a new design tire. Outside diameter 20" inside diameter 17". Tire size could be 225/45-20R:65-17
This genuinely feels like a new, younger version of the old Top Gear, as well as the chemistry between the hosts... I adore it, please keep it up. This is amazing content, I can't believe it's free... I feel like I should be paying for each episode.
I saw something like this about three decades ago. Guy in an Audi (maybe) was upset that he couldn’t keep up with a 2CV in sloppy weather. He mounted 8 2CV tires to his Audi with stunning results. The total load per tire was about the same. Paired skinny little tires versus wide stock tires. That experiment had much better execution. They allowed space between the paired tires so they didn’t rub under load. They allowed for axle load in comparing contact patch. The paired 2CV tires shed water better than the standard (high performance) tire though they did weigh more at each axle. The paired tires couldn’t beat stock tires under normal conditions, but outperformed in wet “real world”. Thanks for the video.
Tyre pressure is very important here. Suspension geometry means the wheels will often not be perpendicular to the road, especially on corners. Tyres need to be at half the pressure (10-20psi) and then adjusted (inside/outside/front/rear) to provide maximum traction.
Wait, you did the single wheel testing on lightweight alloys and semi-slicks but the double-tire testing on regular tires and steelies? Wouldn't that skew the results a lot?
This content is really enjoyable! maybe try like a 25 minute video with you guys also showing the workshop process of making these things. show the banter you guys are having designing and making the stuff. I dont know anything about being a content creator, you guys know what works, but i would like to see stuff like that! Keep it up Driven Media! I am really liking the vibe and banter and all the funny ideas you guys come up with!
There's so many benefits to the dual dually design. First it's trucker tested and approved but there's more. Run flat of course,no need to stop in a dangerous spot and get dirty. High speed blowouts should be stabilized. Double sidewalls should resist cornering loads better. Good rain groove should resist hydroplaning. That same groove creates a cup for flotation in sand and in snow could form it's own rail. Aluminum rims would be lighter and power steering is a must. I've been thinking about a concave center motorcycle tire. It would be less pizza cutter, have two high pressure contact patches per tire and wide spread with low rolling resistance. I'm hoping it might drift instead of wash out.
This was tried in the 1990s to early 2000s. Basically rear motorcycle tires were used. 2 up front. 3 in the rear. Unsprung weight was an issue. Grip was not a big as s single wide tire, per wheel. But they worked great in the wet. The cost of it was the major killing blow.
I love how Scott, while he has a healthy sense of humor about it, he also is visibly in emotional distress lmao. It's top gear all over again. A good time was had by all, me included.
okay, for people not understanding, I had this explained to me a while ago. Double the contact patch, half the weight pushing down on each tyre, meaning half the traction per tyre. Meaning it doesn't give more traction. Doubling the load spread like that also keeps the tyres cooler, because they aren't being worked as hard. This would be not great, but it means you can run softer tyres, and they won't over heat. This is why race tyres aren't just soft, but also really wide :)
@Leonardo Dias yes, but real world it's so minimal that you probably wouldn't notice, and any benefit would probably be outweighed by the weight. Though you are right, soz
My old boss tried boosting the weight our van carried by fitting bigger tyres to the duely back end, The Tyres rubbed at the bottom when it was loaded and it dint take long to get a side wall blow out which took both tyres on the driver side out. BIG BANGS
During the 1980’s, a company called JJD Performance tyres sola dual tyre setup that could be made for any car. It was a single alloy wheel set up to take twin narrow tyres (as any truck driver will tell you, you need a gap between the tyres to allow for sidewall flex, otherwise the tyres will overheat and catch fire). The idea worked reasonably well by all reports, but was poorly promoted, and eventually disappeared.
Scott: - We put eight tyres on a car with no seatbelts and I'm not even gonna wear a helmet! You know what's important though? PRIVACY *Queues NordVPN ad*
The concept is sound for improved safety, just like dual wheels heavy trucks. The tyres definitely need to be thinner, too little weight over a large contact area can also reduce the road grip, especially in the wet.
This reminded me of back in the 1980's when the great Aussie racing driver Peter Brock (R.I.P) did something very similar to a Holden Commodore. It handled better, had better grip, and the tyres run cooler. The suspension had been modded to handle the package. He even had it made legal in Australia. He tried marketing it, but it didn't take off. To extreme and expensive for the times. Another great entertaining video guys. Looking forward to what strange idea you come up with next.
I really like this series. Also what the heck do Caterham make their axels out of?! I thought it was game over with the F1 tires and was sure for these....
Ok - couple things. In the intro I love that they are drinking tea from fine China like they are filming in their grandma’s disused dinning room. Second - why do they have two plates under their teacup?
"Coming up next, shopping carts have the best drift motion around. Watch as we weld on 4.5 trolley wheels in hopes for bigger angle and reverse entry "
It's not surprising the braking was worse, you add width which means (for the same pressure) you're reducing contact patch length. Therefore you're reducing axial traction.
Try it again, but with skinny wheels and tyres. It's the Tyre edges that grip in corners. You can solve bulge rub by using spacers between the wheels. There once was a tyre called Twintire that had a deep groove in the center to simulate two skinny tyres on one wheel.
I find it interesting that you're comparing the F1 slicks with doubling down on tires as if the doubling down is inferior. The interesting part being that there was an F1 car that doubled down on front tires to an incredible result, but was insanely complicated as it was to complete front suspension assemblies. Less windage than you have but much more weight and complication.
I just found this channel yesterday. The 4th video in the series between the Subi and the Lambo was suggested. Watched the entire playlist and it was awesome. Tried this video today just to see if it was a one hit wonder with the Subi showdown and ... it wasn't! Ya'll earned a sub so its now 5.000001% subbed lol
Dually trucks and tractors(semitrucks) Have a gap between the tires to prevent rubbing. Your brake test was contending with increased rotating mass. Aluminum instead of steel would help a lot. Additionally you can safely run lower tire pressure since the load is spread out across more tires. You should try it again, but try a bit harder.
Okay doing this to test myself but I reckon they will come to conclusion the material matters more than the contact patch and the the extra weight at the hubs offset any gains in grip
Not to mentioned on this creation, your differential is not adjusted for two tire on the back even if its listed slip,remember out wills always move fast than inner wheel when making a turn so having two wheels together, would have to be configured different in the differential(e.g. the differentials gears).
In the 1980s there was a twin tyre accessory two were fitted to the Sbarro Challenge of the 1980s. I forget the name of the twin wheel tyre. It has two valves on the outer side of the wheel.
in engineering school we learned that friction is a function of friction coefficient and normal force, contact area is not part of the equation. I am sure in real life it might matter but by how much I don't know.
"Engineering wise": if you would do a double tire setup on wheels for a passenger car, the weight of each rim could be reduced, as "one single normal rim" has to withstand all the forces and loads in driving conditions and therefore would be heavier than one that is only meant to be used together with a second one. The load is then spread over both. Also there needs to be sufficient space betweeen the two tires to allow for typical tire movement. In truck and tractor double wheels that is accounted for. This way the rubbing and potential tire damage throught it gets prevented.
I once bought some narrow wheels with snow rally tyres on for my old Caterham with BL stud pattern and it spun the wheels in every gear. It was for one of those trails events with my local motor club. I got disqualified for not having road tyres :)
The main performance benefit of wider tires is that you can use a softer compound because the load and friction is spread out over a wider area. According to high school physics; dry friction force = coefficient of friction X normal force. Surface area isn't included in that equation because the wider the contact area is, the less the pressure in one square unit of that area. With that said if you had a soft thin tire that only had a contact patch of one square inch, that one spot has to deal with a large amount of force and the rubber starts to tear like a crayon on paper. If you had a hard wide tire there isn't enough force in one square inch to deform the rubber.
