ŠKODA Octavia A5 One of the most popular models of the Czech brand, but even such a time-tested car has nuances that owners will learn only when replacing wheels. One of the key parameters is hub-hole (or DIA- From the English. Diameter Inner Hole*. Its mismatch can lead to rudder beating, accelerated wear of bearings and even emergency situations. In this article, we will discuss everything you need to know about the central hole. Octavia A5: from standard sizes to ways to adapt disks with a different diameter.
Many car owners mistakenly believe that a coincidence is enough. PCD (blathering) and departure (ET), but DIA It's just as important. For example, if the hole in the disk is larger than on the hub, the wheel will be fastened not in the center, but through the wheel. centering rings It is a temporary solution that does not guarantee perfect balance. In the article you will find not only theoretical data, but also practical tips for measuring, selecting discs and even instructions for squandering the hub (if possible).
Standard dimensions of the central opening ŠKODA Octavia A5
For Octavia A5 (including restyled versions from 2009-2013) the manufacturer states hub-hole 57.1 mm. This parameter is the same for all model modifications, regardless of the type of drive (front or full). 4x4) and engine capacity. But there are nuances:
- 🔧 Stock drives from ŠKODA or VW Group (for example, Golf V, Passat B6) always have DIA = 57.1 mm.
- 🔄 Analogues from other brands (for example, BBS, OZ Racing) may have a 66.6 mm hole, which is standard for many European cars, but not for the car. Octavia A5.
- ⚠️ Discs from Audi (even with the same slurring)
5×112) often have DIA = 66.6 mm - they cannot be installed without adaptation.
It is important to understand that 57.1 mm is not a rounded value. For example, some sources indicate 57 mm, but a difference of 0.1 mm can lead to a backlash of the wheel. If you buy disks with a 66.6 mm hole, you will need to use it. centering rings with an outer diameter of 66.6 mm and an inner diameter of 57.1 mm.
- Stock (57.1 mm)
- Aftermarket (66.6mm with rings)
- Others (please specify in comments)
- I don't know
How to measure the center hole of the hub yourself
If you are not sure about the DIA size of your Octavia A5, you can measure it yourself. For this you will need caliper or even a regular ruler (if accuracy is not critical). Algorithm of actions:
- Remove the wheel and clean the hub from dirt.
- Measure the diameter of the hole in the hub (do not confuse it with the diameter of the bearing!).
- Check the diameter of the hole in the disk (if you have already purchased it).
If you don't have a caliper, you can use drill or bolt of known diameter:
- Take a 57mm drill and try to insert it into the hole in the hub. If it fits with a slight tension, the size is correct.
- If the 57 mm drill does not fit, and the 58 mm drill is free, then the hole is closer to 57.1 mm.
When measuring with a ruler, apply it to the edges of the hole and divide the result by 2. For example, if the distance between the edges is 5.7 cm, then the diameter is 57 mm.
Please note: some Octavia A5 after replacing hubs or bearings, the hole can be bored to 57.5–58 mm. This is not critical, but requires the use of rings with an internal diameter of 58 mm.
Consequences of a mismatched center hole
Installing disks with the wrong DIA is one of the most common mistakes when tuning Octavia A5. The consequences can be either barely noticeable or critical:
- 🚗 Steering wheel beating at speeds over 80 km/h - the most common symptom. Vibration can also be transmitted to the body.
- 🔥 Accelerated bearing wear due to uneven load. The bearing begins to “hum” after 10–15 thousand km.
- ⚠️ Spontaneous loosening of nuts — if the disk is not centered, the fastening weakens under dynamic loads.
- 💥 Broken studs in extreme cases (for example, during sudden braking or falling into a hole).
Critical point: even if the disk physically fits on the hub (for example, the DIA of the disk is 66.6 mm and the hub is 57.1 mm), without centering rings the wheel will be bolted on, and not through the center hole. This leads to an imbalance that cannot be corrected by balancing weights.
⚠️ Attention: If after replacing the disks a runout appears, do not rush to do a wheel alignment. First check that the DIA matches and that the centering rings are present. In 70% of cases, the problem is solved by installing them.
| Problem | Reason | Solution |
|---|---|---|
| Steering wheel wobble at speed | Disc DIA > Hub DIA (no alignment) | Install centering rings |
| Bearing noise after 10 thousand km | The disk is displaced relative to the axis of rotation | Replace rings or disc |
| Spontaneous loosening of nuts | Uneven tightening due to misalignment | Tighten the fastenings with a torque of 120 Nm |
| Cracks on the disk | Local overloads due to imbalance | Replace disk, check DIA |
Centering rings: how to choose and install
If you bought wheels with a 66.6 mm DIA (standard for many European cars), they can be adapted to Octavia A5 with the help centering rings. These parts are made of plastic or aluminum and perform two functions:
- Center the disc relative to the hub.
- Fills the gap between holes, preventing corrosion.
For Octavia A5 Rings with the following parameters are suitable:
- 🔄 External diameter: 66.6 mm (under disc).
- 🔧 Inner diameter: 57.1 mm (under the hub).
- 📏 Thickness: 10–15 mm (depending on the depth of the seat).
Installing the rings takes no more than 5 minutes:
Clean the hub and disc from dirt|Place the ring on the hub (should fit tightly)|Install the disc and check for play|Tighten the nuts crosswise to a torque of 120 Nm-->
Important: the rings must fit no gaps. If they turn or dangle, it means the size is chosen incorrectly. Aluminum rings are preferable to plastic ones - they do not deform when heated and last longer.
⚠️ Attention: Do not use homemade rings from scrap materials (for example, PVC pipes). They cannot withstand loads and can crack when moving.
Is it possible to bore the hub to a different diameter?
If you find the perfect wheels, but their DIA is greater than 57.1 mm, the question arises: can the hub be bored? Theoretically, yes, but with reservations:
- ✅ Allowable boring: up to 60 mm (maximum). Deeper machining will weaken the hub.
- ⚠️ Risks: geometry violation, bearing overheating, decreased rigidity.
- 🔧 Alternative: It's easier to buy rings or discs with the correct DIA.
The boring process looks like this:
- Remove the hub from the car (a puller will be required).
- Fasten it in the lathe.
- Bore the hole to the required diameter (for example, 66.6 mm).
- Check runout after installation.
The cost of work at a service station is from 1,500 rubles per hub. However Boring does not guarantee perfect alignment, as alignment with the bearing may be disrupted. This method is recommended only in extreme cases when other options are not possible.
What happens if you bore the hub too much?
If the permissible diameter is exceeded (more than 60 mm), the walls of the hub become too thin. This leads to:
- Deformation due to impacts (for example, when falling into a hole).
- Overheating of the bearing due to heat dissipation failure.
- Risk of separation of the hub from the axle under extreme loads (for example, in drifting).
In most cases, boring is not justified - it is cheaper and safer to select wheels with the correct DIA.
Compatible with drives from other models VW Group
Owners Octavia A5 people often ask whether it is possible to install wheels from other Concerna models Volkswagen. Here's a quick compatibility guide:
| Donor model | DIA (mm) | PCD | Compatible with Octavia A5 |
|---|---|---|---|
| VW Golf V | 57,1 | 5×112 | ✅ Complete (no modifications) |
| VW Passat B6 | 57,1 | 5×112 | ✅ Full |
| Audi A3 (8P) | 66,6 | 5×112 | ⚠️ Requires rings 66.6→57.1 |
| Seat Leon 1P | 57,1 | 5×112 | ✅ Full |
| VW Tiguan (5N) | 66,6 | 5×112 | ⚠️ Rings required |
Please note disc ejection (ET). For example, disks from Passat B6 may have an ET of 35–45, whereas for Octavia A5 optimal reach is 38–45 mm. Too much or too little ET will reduce handling and increase stress on the suspension.
If you take wheels with a bolt pattern 5×100 (for example, from Golf IV), remember: they can only be installed using eccentric bolts, but this is a temporary solution. It is better to avoid such combinations.
Discs from Audi with DIA 66.6 mm - the most common option for tuning Octavia A5, but they require the mandatory installation of centering rings. Without them, steering wheel wobble is guaranteed.
Common mistakes when selecting disks and how to avoid them
Even experienced car owners sometimes make mistakes when choosing wheels for Octavia A5. Here are the most common of them:
- 🔍 Ignoring DIA: many people only look at
PCDandET, forgetting about the central hole. - 📏 Incorrect measurement: Measure the diameter of the bearing instead of the hub bore.
- 🔧 Saving on rings: buy cheap plastic rings that become deformed.
- ⚠️ Self-boring without a lathe (for example, a drill).
- 🚗 Installing drives with ET out of range (eg ET 20 or ET 50).
To avoid problems:
- Always check hub and disc DIA before purchase.
- Buy centering rings from trusted manufacturers (for example, H&R, Eibach).
- When boring the hub, contact only professionals.
- After installing new disks, be sure to do balancing and check the runout at a speed of 100–120 km/h.
If you buy used wheels, pay attention to the condition of the centering hole. Often it is deformed from previous installations, and even new rings will not help.
FAQ: Answers to frequently asked questions
Is it possible to drive without centering rings if the disc is tight?
No. Even if the disk physically sits on the hub, without alignment the load is distributed unevenly. This leads to the steering wheel wobbling, accelerated wear of the bearings and the risk of the nuts coming loose. Rings are inexpensive (from 200 rubles apiece), but they prevent serious problems.
What wheels are suitable for Octavia A5 without modifications?
Any disks with parameters:
- DIA: 57.1 mm;
- PCD: 5×112;
- ET: 38–45 mm;
- Diameter: R15–R18 (depending on modification).
Stock wheels from Golf V, Passat B6, Seat Leon 1P.
What should I do if a runout appears after replacing the disks?
First check:
- Matching DIA of the hub and disc (or presence of rings).
- The tightening torque of the nuts (must be 120 Nm).
- Wheel balancing.
- Wheel bearing condition.
If the runout remains, the disc may be deformed or the hub is bored unevenly.
Is it possible to install wheels with DIA 72.6 mm (for example, from BMW)?
Technically possible, but you will need centering rings 72.6→57.1 mm. However, such rings are difficult to find on sale, and their thickness will be significant, which can lead to imbalance. It is better to avoid such combinations and choose wheels with a DIA of 57.1 or 66.6 mm.
What is the nut tightening torque for Octavia A5?
For Octavia A5 wheel nut tightening torque - 120 Nm. Use a torque wrench to avoid over-tightening or under-tightening. Tighten the nuts criss-cross in 2–3 approaches.