{"title":"Tire changers","description":"\u003ch2 id=\"speakable-headline\"\u003eTire changers: what they do and what they demand\u003c\/h2\u003e\n\n\u003cblockquote id=\"speakable-summary\"\u003e\n  \u003cp\u003e\u003cem\u003eWhat does a tyre changer do? It pushes the tyre bead off the rim, lifts the tyre over the edge and fits the new one, without anyone going at the rim flange with a tyre lever. What matters is rim protection, air supply and the free space around it.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003cp id=\"speakable-definition\"\u003e\u003cstrong\u003eTire changers\u003c\/strong\u003e are floor-standing machines that separate a tyre from the rim and fit it back on mechanically. Three assemblies share the work: a pneumatic bead breaker blade pushes the bead out of the rim well, a turntable holds the rim with four clamps, and a mounting head guides the tyre over the rim flange. The whole thing is powered by compressed air and an electric motor. In car detailing, the machine belongs wherever wheels get moved around individually a lot.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThe mounting head decides the rim's fate.\u003c\/strong\u003e A plastic head or a roller system keeps two to three millimetres of clearance from the edge the tyre gets pulled over. What that means for you: without that protection, every change leaves a nick in the rim flange that no polish will bring back.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompressed air is the real prerequisite.\u003c\/strong\u003e Bead breaker, turntable and bead lifter all work pneumatically and want 8 to 10 bar at the inlet. A compressor with a 50-litre tank handles two to three wheels in a row and then kicks in on every other move.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eYou need more space around it than the machine takes up.\u003c\/strong\u003e The footprint is roughly one metre square, the working radius around two and a half metres. You walk the wheel in a circle around the turntable, and that circle has to stay clear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n  \u003cp\u003e\u003cstrong\u003eDetailing1's tip from the shop:\u003c\/strong\u003e We often get questions about nicks and gouges that show up on the rim flange after a wheel change. The cause is rarely the mounting head and almost always the bead breaker blade, which sits on the outside of the sidewall and slips over the rim edge. Set the blade close to the tyre instead of the metal, work all the way round in small steps instead of full force at two spots, and put mounting paste on the bead first. And before the blade even comes near: valve core out, let all the air out, and with tyre pressure sensors, check where the valve sits. A sensor costs more than the entire tyre change.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eThree steps on every wheel\u003c\/h3\u003e\n\n\u003cp\u003eEvery tyre change comes down to three moves: break the bead off the rim flange, lift the tyre over the edge and guide the new one back on.\u003c\/p\u003e\n\n\u003cp\u003eThe bead is the reinforced edge of the tyre, with a steel cable running round inside it. It presses against the rim flange, and air pressure holds it there. After two winters it's stuck on as well, because moisture forms a thin oxide layer between rubber and aluminium.\u003c\/p\u003e\n\n\u003cp\u003eThe bead breaker blade pushes right at that spot, with around two tonnes of force from a pneumatic cylinder. There's no doing that by hand, and every attempt with a lever and body weight ends in the same place: the rim edge.\u003c\/p\u003e\n\n\u003cp\u003eYou break the bead on both sides. The upper bead usually comes away willingly, the lower one sits much tighter after a season in salty water and needs two or three goes all the way round. Try it in one big push and you're more likely to deform the sidewall than free the bead.\u003c\/p\u003e\n\n\u003cp\u003eThen the turntable clamps the rim. Four jaws grip into the rim well from the inside or onto the flange from the outside, depending on rim width. Clamping from the inside is the gentler option, because the jaw sits on a surface nobody ever sees.\u003c\/p\u003e\n\n\u003cp\u003eThen comes the mounting head. It sets itself a few millimetres from the flange, a lever pulls the bead over it, and the turntable spins the wheel one full turn. Fitting runs the same move in reverse.\u003c\/p\u003e\n\n\u003cp\u003eFinally, the bead has to pop back onto its seat. On wide wheels the normal airflow isn't enough for that, which is why many machines have an air blast built into the clamping jaws. The bang that comes with it is part of the process, not a fault.\u003c\/p\u003e\n\n\u003ch3\u003eMachine types differ at the assist arm\u003c\/h3\u003e\n\n\u003cp\u003eThe main difference between types is how much force the operator puts in and how much the machine takes off their hands.\u003c\/p\u003e\n\n\u003cp\u003eOn semi-automatic machines, you swing or tilt the mounting arm aside by hand, set the head to the rim and lock it. The tilting arm is quicker, the swing arm more stable. For a manageable throughput, either will do.\u003c\/p\u003e\n\n\u003cp\u003eFully automatic machines position the head themselves and hold the clearance via a stop. That takes out one source of error, costs a lot more and only pays for itself when wheels go through every day.\u003c\/p\u003e\n\n\u003cp\u003eThe most important add-on is called an assist arm or helper arm: a second boom with a roller and hold-down that pushes the bead into the drop centre and keeps it there. Without it, you won't get a stiff sidewall over the flange without stressing it.\u003c\/p\u003e\n\n\u003cp\u003eThe third level works without a mounting head at all. Two rollers come in from the outside and roll the bead over the edge, and the tool never touches the rim. For forged wheels and delicate finishes, that's the safest type.\u003c\/p\u003e\n\n\u003cp\u003eMaintenance barely registers on these machines, yet it decides how long they last. The pneumatics need a service unit with a water separator and lubricator, because otherwise condensation from the line ends up in the cylinders. A look at the oil level and separator every few weeks is enough.\u003c\/p\u003e\n\n\u003cp\u003eThen there's the clamping range. Standard machines take about 10 to 22 inches clamped from the outside; bigger wheels and vans need more. Check the figure against the wheels you actually handle, not the biggest number in the brochure.\u003c\/p\u003e\n\n\u003ch3\u003eRim protection isn't an optional extra\u003c\/h3\u003e\n\n\u003cp\u003eOn an alloy wheel, the result isn't decided by the machine's power but by every single spot where steel meets aluminium.\u003c\/p\u003e\n\n\u003cp\u003eThe rim flange is the curled edge the tyre gets pulled over — and at the same time the most visible surface on the whole wheel. A nick there sits right in your line of sight once the wheel is back on the car.\u003c\/p\u003e\n\n\u003cp\u003eThat's why the mounting head, bead breaker blade and clamping jaws have plastic inserts. They're wear parts: after a few dozen wheels they're worn in and no longer do their job. You'll notice when the first fine lines appear on light-coloured wheels.\u003c\/p\u003e\n\n\u003cp\u003eThe mounting head needs clearance from the flange, usually two to three millimetres. Too close means contact, too far means the bead gets pinched between head and rim. Getting that setting right is the move that takes practice.\u003c\/p\u003e\n\n\u003cp\u003eWith polished, chromed or matte-painted wheels, that's not enough. There, a protective jaw cover or plastic strip goes on the flange as well, and the roller bead breaker replaces the blade. Two minutes of effort against damage no polish can bring back.\u003c\/p\u003e\n\n\u003cp\u003eThe turntable itself needs to be kept clean. A shard of old stick-on weight or a grain of gritting chippings on the jaw presses into the inside of the rim when you clamp it and leaves a mark you only see once the wheel is lying on the floor again.\u003c\/p\u003e\n\n\u003cp\u003eAnd then there's the paste. Mounting paste cuts the friction between bead and flange so much that the tyre glides instead of jerking. Skimp on it and you're fighting the rubber and the rim at the same time. It's the cheapest tool in the whole process.\u003c\/p\u003e\n\n\u003ch3\u003eRun-flats and low profiles ask more of you\u003c\/h3\u003e\n\n\u003cp\u003eModern tyres have got stiffer, and that stiffness is exactly what separates a five-minute wheel from a damaged bead.\u003c\/p\u003e\n\n\u003cp\u003eRun-flat tyres have reinforced sidewalls that carry the car even with no air in them. That wall doesn't just squash. In practice: without an assist arm you won't get the opposite bead into the drop centre, and without the drop centre you'll tear material.\u003c\/p\u003e\n\n\u003cp\u003eThe drop centre is the dip in the middle of the rim. The bead has a smaller circumference than the rim flange, so it has to drop into that well on one side before it can get over the edge on the other.\u003c\/p\u003e\n\n\u003cp\u003eLow-profile tyres bring the same problem in a different form. With a sidewall only a few centimetres tall, there's simply none of the give that lets a tall tyre forgive a sloppy move.\u003c\/p\u003e\n\n\u003cp\u003eCold rubber is less forgiving. A tyre that comes off the rack at five degrees is much stiffer than one that's sat at twenty degrees for a few hours. Letting winter tyres warm up before fitting takes effort out of every single move.\u003c\/p\u003e\n\n\u003cp\u003eThen there are tyre pressure sensors. They sit on the valve or as a band in the rim well and easily end up under the blade when breaking the bead. The rule is simple: find the valve first, then set the blade — on the opposite side.\u003c\/p\u003e\n\n\u003cp\u003eAfter fitting, check every wheel. Bead seating shows on the moulded guide line around the sidewall: it has to run the same distance from the flange all the way round. A spot that strays by two millimetres is a vibration you won't balance out afterwards.\u003c\/p\u003e\n\n\u003ch3\u003eWithout a wheel balancer, the wheel stays shaky\u003c\/h3\u003e\n\n\u003cp\u003eA tyre changer alone doesn't make a wheel ready to drive. The second half of the job happens on the wheel balancer, and that's the half the driver actually feels.\u003c\/p\u003e\n\n\u003cp\u003eImbalance means the mass isn't evenly distributed around the axis of rotation. Just fifteen grams too much in one spot creates enough centrifugal force at 120 km\/h to come through the steering wheel as a shimmy.\u003c\/p\u003e\n\n\u003cp\u003eTwo kinds come together. Static imbalance makes the wheel hop, dynamic imbalance makes it wobble around its own axis and shows up as a shake in the front axle. A balancer measures both by spinning the wheel up and recording the deflection on two planes.\u003c\/p\u003e\n\n\u003cp\u003eYou correct it with weights. Clip-on weights clamp onto the rim flange and belong on steel wheels; stick-on weights go on the inside behind the spoke and are the pick for alloys. The bonding surface has to be degreased first, otherwise the weight will be lying in the wheel arch after the first warm day.\u003c\/p\u003e\n\n\u003cp\u003eThe most common measuring error happens before you measure. If the wheel isn't sitting perfectly centred on the cone, the machine reports an imbalance that doesn't exist, and you end up sticking on weights to fix a clamping mistake.\u003c\/p\u003e\n\n\u003cp\u003eThat's why both machines get planned together, with one compressor feeding both and a torque wrench for the wheel bolts. Buy the tyre changer and drive over to the neighbour's to balance, and you've thrown away exactly the time you wanted to save.\u003c\/p\u003e\n\n\u003ch3\u003eSpace, compressed air and the honest maths\u003c\/h3\u003e\n\n\u003cp\u003eBefore you choose, three figures go on the list: the free space around it, the compressor's output and the number of wheels that really go through in a year.\u003c\/p\u003e\n\n\u003cp\u003eThe machine's footprint tells you little here. You walk the wheel round the turntable, tilt the arm aside and put tyres down. Allow around two and a half metres of clearance in every direction and plan the route to the wheel, not just the spot where the machine stands.\u003c\/p\u003e\n\n\u003cp\u003eThe machine gets bolted to the floor. Breaking beads and spinning the wheel generate forces that would tip a free-standing unit. Manufacturers usually specify concrete of at least grade C25\/30 for this. Screed over an insulation layer doesn't meet that, even if it feels hard.\u003c\/p\u003e\n\n\u003cp\u003eCompressed air is the figure people underestimate most often. The machine wants 8 to 10 bar at the inlet and draws that air in short, powerful bursts. So what matters isn't peak pressure but tank volume: below 50 litres, the compressor kicks in on every other move.\u003c\/p\u003e\n\n\u003cp\u003eThen there's the power supply. Small machines run on 230 volts; as soon as you need more torque at the turntable, three-phase 400-volt power is due. Three phases instead of one means more power with the same cable cross-section, and without that connection a whole class of machine drops off the list.\u003c\/p\u003e\n\n\u003cp\u003eAnd the honest take: if you swap your own four wheels twice a year, a set of complete wheels and a torque wrench are cheaper and quicker. Your own tyre-fitting kit pays for itself once customer wheels come into play or tyres get moved individually a lot. To get at the wheel, a \u003ca href=\"\/collections\/wagenheber\"\u003eCar jack\u003c\/a\u003e with axle stands will do; it gets more comfortable on one of our \u003ca href=\"\/collections\/hebebuehne\"\u003eCar lifts\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eWhere these machines fit in the overall setup is covered under \u003ca href=\"\/collections\/werkstatteinrichtung\"\u003eWorkshop equipment\u003c\/a\u003e, and what's next for the finished wheel is under \u003ca href=\"\/collections\/reifen-und-felgen\"\u003eTyres and wheels\u003c\/a\u003e. If you're unsure about clamping range, air supply or floor space, drop us a quick message with your connection specs. That one message saves money more often than any comparison of data sheets.\u003c\/p\u003e","products":[],"url":"https:\/\/detiiling1.com\/collections\/reifenmontiermaschinen.oembed","provider":"Detailing1","version":"1.0","type":"link"}