Bent rim repair is the most common wheel job in pothole season. One hard hit bends the inner lip, and the signs arrive over the next few days: a shake through the steering wheel at highway speed, a tyre that needs air every week, or a fitment centre that cannot get the wheel to balance. A bent rim can often be straightened on a hydraulic machine and put back on the road. Here is how a repairer measures the bend, how the straightening is done, and when a wheel is too far gone.
Signs your rim is bent
- A vibration that starts around 80 to 100 km/h and does not go away after balancing.
- A slow leak at the bead, because the tyre no longer seals against the deformed lip.
- A visible flat spot or kink on the inner lip when you look behind the wheel with a torch.
- A fitment centre that keeps adding weight and still sees the wheel wobble on the balancer.
Bends on the inner lip are the most common, since that side takes the pothole edge and you cannot see it from the outside.
How runout is measured and fixed
The repairer mounts the bare wheel on the machine and spins it against a dial gauge. Radial runout is the wheel moving up and down as it turns; lateral runout is it moving side to side. Marking the high and low spots shows exactly where the bend is. On alloy wheels the area is warmed with controlled, gentle heat so the metal moves without cracking, then a hydraulic ram pushes it back a little at a time, checking with the gauge between presses. Steel rims on bakkies, trailers and spare wheels can usually be straightened cold. A careful shop checks the straightened area for hairline cracks before the tyre goes back on.
When a bent rim should not be straightened
Straightening has limits. A deep, sharp bend stretches the metal, and pushing it back can leave it thin or cracked. Repairers usually decline when:
- the bend runs into the spokes or the face of the wheel, not just the lip;
- the wheel is bent and cracked in the same area;
- the wheel has been straightened or welded before in that spot;
- the barrel is out of round all the way around after a severe hit.
In those cases a replacement wheel, new or a checked second-hand one, is the safe choice. If a crack is found during straightening, see cracked rim repair.
After the repair: balance, leak and alignment
A straightened wheel needs the tyre refitted, ideally with a new valve, then a fresh balance, because the weight distribution has changed. Ask the shop to check the bead for leaks with soapy water or in a tank. A pothole hard enough to bend a rim can also knock the steering out, so if the car pulls or the steering wheel sits off centre, book a wheel alignment as well. Check the tyre sidewall for a bulge too; a damaged tyre must be replaced.
What to put in your request
- Which wheel is bent and the wheel size
- Alloy or steel, and the finish
- Symptoms: vibration, slow leak, no balance
- Whether the tyre also has a bulge or cut
- Whether you also want an alignment check
Bent Rim Repair for drivers, fleets and workshops
- Private car owners: a pothole bend on the inner lip causing a shake at highway speed
- Enthusiasts, 4x4 and performance drivers: low-profile aftermarket wheels trued after a hit on a rough road
- Company and rental fleets: pool cars and rentals with bent wheels straightened after pothole damage
- Dealers, panel shops and insurers: trade-ins with a vibration traced to a bent rim, fixed before sale
- Tyre shops and wheel workshops: fitment centres sending wheels that won't balance for straightening
- Truck, bus and taxi operators: steel rims on delivery vans and minibus taxis pressed straight
- Farms: dented steel rims on bakkies and trailers pressed back after gravel roads
- Mines and construction sites: bent light vehicle wheels from haul roads, straightened or condemned
Frequently asked questions
Can a bent rim be fixed while the tyre is on?
My steel bakkie rims are dented. Are they worth fixing?
Does straightening weaken an alloy wheel?
Do you straighten rims yourselves?
Bent Rim Repair by province and city
- Johannesburg
- Pretoria
- Centurion
- Midrand
- Sandton
- Randburg
- Roodepoort
- Krugersdorp
- Randfontein
- Germiston
- Boksburg
- Benoni
- Kempton Park
- Alberton
- Vanderbijlpark
- Vereeniging
- Durban
- Pinetown
- Pietermaritzburg
- Richards Bay
- Newcastle
- Ladysmith
- Gqeberha (Port Elizabeth)
- East London
- Kariega (Uitenhage)
- Mthatha
- Cape Town
- Bellville
- Paarl
- Stellenbosch
- George
- Worcester
- eMalahleni (Witbank)
- Middelburg
- Secunda
- Mbombela (Nelspruit)
- Rustenburg
- Brits
- Klerksdorp
- Potchefstroom
- Mahikeng
- Polokwane
- Tzaneen
- Kimberley
- Upington
- Bloemfontein
- Welkom
- Sasolburg