Owners Skoda Octavia A7, released in 2019, are often faced with the need to replace rims, be it a seasonal change of tires or a desire to improve the appearance of the car. Correct selection of parameters is critical for driving safety, since errors in geometry can lead to suspension destruction or loss of control.
The key parameter when choosing a disk is bolt pattern, which determines the number of bolts and the diameter of the circle on which they are located. For the 2019 model, this parameter is standardized, but there are nuances depending on the body type and configuration that you need to know about before purchasing a new kit.
Basic mounting parameters for Skoda Octavia A7 2019
The vast majority of cars Skoda Octavia the third generation (A7), including the 2019 restyled version, use a unified wheel mounting scheme. The standard value is 5x112, which means there are five mounting holes located around a circle with a diameter of 112 millimeters. This indicator is identical for many models of the concern Volkswagen Group.
The second equally important parameter is the central bore diameter, or DIA (or CB). For the model under consideration it is exactly 57.1 mm. If you install a disc with a large hub diameter, the wheel will wobble, causing the steering wheel to wobble. If the diameter is smaller, the disc simply will not fit on the hub, and you will have to use adapter rings, which is undesirable.
It is also necessary to take into account the wheel offset, denoted as ET. For Octavia A7 The standard reach range varies from 43 to 54 mm. Using discs with an offset that is very different from the factory one creates additional stress on the wheel bearings and suspension arms, which can lead to their premature failure.
Nuts or bolts used for fastening must conform to the manufacturer's specifications. Usually it is a metric thread M14x1.5 with a conical seat at an angle of 60 degrees. Using a fastener with the wrong seat angle may cause the wheel to come loose while driving, despite being tightened.
β οΈ Caution: Never attempt to install wheels with a 5x114.3 or 5x100 bolt pattern to a hub. Skoda Octavia A7, even if the holes match with the help of rework. This is a gross violation of safety rules that is guaranteed to lead to an accident.
Standard wheel and tire sizes for various trim levels
Depending on the level of equipment and body type (liftback or combi Combi), plant Skoda offers several options for standard disks. Base trims are often equipped with 15- or 16-inch steel wheels, while top-end trims can have cast or forged wheels up to 18 inches in diameter.
To ensure the correct operation of the control stability system and the anti-lock braking system, the total rolling radius of the wheel must remain within acceptable limits. Therefore, when increasing the diameter of the disk, it is necessary to reduce the profile of the rubber. For example, for a 16-inch disk, a typical rubber is the size of a wheel. 205/55 R16And for a 17-inch, 215/50 R17.
The table below shows the most common standard wheel sizes for the 2019 model, which are guaranteed to fit without intervention in the suspension:
| Disc diameter (R) | Disc width (J) | Tire size | offset (ET) | Note |
|---|---|---|---|---|
| 15 | 6.0 | 195/65 R15 | ET45 | Basic equipment |
| 16 | 6.5 | 205/55 R16 | ET48 | Most popular size |
| 17 | 7.0 | 215/50 R17 | ET50 | Comfort and handling |
| 18 | 7.5 | 225/45 R18 | ET52 | Sports style |
β οΈ Attention: When installing tires with a low profile on larger diameter discs, be prepared for the fact that the vehicle's permeability will decrease, and the risk of damage to the curb disc will increase significantly.
- R15
- R16
- R17
- R18
- More than 18.
Nuances of installation of non-standard disks and adapters
Many car owners are looking to install wheels with a wider hook or unusual design that are not included in the regular lineup. In such cases, it is critical to check the parameter. PCD and departure. If you find a beautiful drive with departure ET35instead of regular ET50The wheel will protrude beyond the arch, which can be illegal and dangerous.
For correction of offset, spacers between the disk and the hub are often used. However, their use requires caution. The rod increases the shoulder of the run-in, which increases the load on the steering rods and bearings. In addition, standard bolts can become too short, which will require replacing the fastener with an elongated one.
Sometimes there are discs in which the central channel has a diameter of 66.1 mm. They'll physically climb on the hub. SkodaBut there will be problems with the centering. In this case, necessarily You need to use transition rings (center rings) made of durable plastic or aluminum to eliminate backlash.
If the bolt is not twisted at least 8-10 full turns of thread, the mounting is considered unreliable. Elongated bolts must have the same thread pitch M14x1.5 and a 60 degree cone.
βοΈ Checking the compatibility of a non-standard disk
Why can't you just drill the disks?
Re-drilling holes under another bolt pattern (e.g., 5x112 to 5x114.3) is an extreme method that disrupts the geometry of the metal, weakens the disc and creates the risk of its destruction at high speeds. The disc may crack along a line of new holes, resulting in instantaneous wheel loss.
The effect of squabbling on suspension and safety
Incorrect selection of wheel parameters directly affects the durability of the suspension. When the center of the wheel is shifted relative to the axis of rotation (due to improper PCD or lack of alignment), vibration occurs. This vibration is transmitted to the hub bearings, causing them to overheat and destroy in a few thousand kilometers.
The offset change (ET) changes the levers of influence on the suspension levers and steering tips. If you install a disc with a smaller offset (the disk sticks out stronger), the shoulder of the run-in increases. This makes the steering wheel heavier, but also increases sensitivity to road irregularities and increases tire wear.
When driving on a track with improperly installed wheels, the effect of a βfloatingβ steering wheel or unpredictable behavior of the car when braking can occur. This is especially dangerous in the rain or on ice, when the grip on the road is minimal.
Any deviation from the factory parameters of the squashing and departure should be justified by technical calculations and approved by the manufacturer, otherwise this is a direct path to the breakdown of the suspension and accident.
Choice of fasteners: bolts or nuts
It is important to distinguish between the mounting systems. Cars. Skoda Octavia A7 Bolts are most often used, but in some configurations or after replacing the hubs, nuts can be used. The main rule is the shape of the cone.
Bolts and nuts for VAG (Volkswagen Audi Group) have a conical landing with an angle of 60 degrees. If you use a radial seat fastener (as on many American or old Japanese cars), the wheel will not press tightly against the disc, and a backlash will appear.
The length of the bolt also plays a role. Standard length for Octavia A7 It is about 27 mm of the carving part. When using the pads, you need to add the length of the pad to the length of the bolt, but do not exceed the permissible depth of the hole in the hub so that the bolt does not rest on the bottom.
- β Use only the fastener with the markings M14x1.5 and an angle of 60Β°.
- β Check the length of the bolt before installation - it should go at least 8 turns.
- β Replace all bolts on one wheel without mixing old and new.
- β
Use a dynamometer key to tighten with the moment
120 Nm.
Pushing process and moment control
The correct tightening of the wheel bolts is the guarantee that the disk will not fly off. Puffing moment for Skoda Octavia A7 amounts to 120 Nm. Underestimation of this value will lead to weakening of the attachment, and excess can break the thread or deform the disk.
The slacks need to be tightened cross-over. This ensures a uniform adjoinment of the disc to the hub. First, tighten all the bolts from your hand, then pull them up with a dynamometer key in a specific sequence. Never tighten the wheels "turnkey" immediately to the end until the car is raised.
After installing a new set of wheels, be sure to check the moment of tightening through 50-100 kilometers of run. The metal may slightly "sit down", and the fastener may weaken. Regular inspection once a season is a mandatory procedure for any owner.
Use a graphite lubricant or a special spray to thread bolts, but DO NOT apply oil or fat to the landing conical part of the bolt - this will change the moment of friction and can lead to stretching or under-lifting.
How to check the moment of puffing without a key?
Without a dynamometer key, it is impossible to verify the exact moment. However, you can visually inspect the labels on the disk and bolt, if they were applied with a marker during the previous puff. If the tags matched, the bolt didn't spin. But it's not a substitute for an instrument.
Common mistakes when selecting disks
One of the most common mistakes is to ignore the disk width (J). Too narrow a disc for a wide tire will cause the tread to be a "hump", which will worsen the grip. Too wide a disc will cause the tire to stretch, which will make the sidewall rigid and vulnerable.
The second mistake is to buy disks βwith handsβ without checking geometry. Even visually, the entire disc may have hidden cracks or deformation of the landing hole, making it unsuitable for installation on the hub. Skoda within a hundredth of a millimeter.
Also often forget about the gap to the brake caliper. Sports calipers can be too large, and even with proper bolt pattern, the disc can touch them, especially when turning the steering wheel.
- β Do not buy discs without checking the size of the central hole.
- β Do not use cheap transition rings made of soft plastic.
- β Do not ignore the gap to the brake mechanisms.
β οΈ Attention: The 5x112 squash is a critical parameter that cannot be changed without serious engineering revision of the car, since the hub is a critical element. Octavia A7 It is designed strictly for this step of holes.
FAQ: Questions and answers on the wheels of the Skoda Octavia A7
Can I install 5x114.3 discs on Octavia A7?
No, you can't. The 5x114.3 hole pitch does not match the 5x112. Attempting to install such disks will lead to the fact that the bolts will not fit into the holes, or unsafe modification of the disk will be required, which is prohibited by safety rules.
What is the maximum size of the disc on the Octavia A7?
The factory recommends a maximum of 18 inches. However, with the right tire selection and checking the gaps, you can install 19-inch discs, but this will require checking for grazing for arches and calipers, and can also worsen comfort.
Do I need to use the sleeves when installing cast disks?
Not necessarily. If the offset (ET) of new discs coincides with the factory or differs slightly (within 5 mm), the spacers are not needed. They are only required if you want to change the gauge or the offset, and then with caution.
What is the moment of tightening of wheel bolts for the Ε KODA Octavia A7?
Standard tightening moment for all wheel bolts on Skoda Octavia A7 is 120 Newton meters (Nm). Use a torque wrench to maintain this value exactly.
What if the central diameter of the disk is greater than 57.1 mm?
If the diameter of the central opening of the disc is greater than 57.1 mm, centered rings (adapters) with an external diameter of 57.1 mm and an internal corresponding to the disk should be used. This will ensure the centering of the wheel on the hub.