One benefit of using the standard 175/60R15 fitted to the standard 5.5Jx15 ET34 rim, is that it will fit in the spare wheel well.
However, a slightly oversize 185/60R15 would be the same width if fitted to a narrower 5Jx15 ET28 rim so would also fit in the spare wheel well, as shown in the chart below.
If you want to continue driving at normal speeds after getting a puncture, this could be worth considering...instead of fitting a different sized spare and being limited to 50mph and rather compromised handling.
The 175 and 185 shown on a tyre's sidewall is simply the nominal width. The actual inflated width of a tyre always depends on the width of the rim to which it is fitted. If you were to fit a 185/60R15 to a 5.5J rim, it's actual inflated width would be 189mm, and if you were to fit a 185/60R15 to a 6J rim, it's actual inflated width would be 195mm. So as you can see, it's only when you fit a 185/60R15 to a 5J rim does its actual inflated width become the same as a 175/60R15 fitted to a 5.5J rim.
Actual width of inflated tyre
175/60R15 fitted to 5.5J rim 183mm
185/60R15 fitted to 5J rim 183mm
185/60R15 fitted to 5.5J rim 189mm
185/60R15 fitted to 6J rim 195mm
Notice in the chart below that 8Z0601027 and 8Z0601027 03C is the same OEM part number. The associated 03C is simply the 3-digit colour code, which as shown in the chart below means "rally black". When searching online, it's normal just to use the shortened version without the 3-digit colour code.
Audi A2 original 15" steel rims
2 | 8Z0601027 | Steel rim | 5.5Jx15 ET34 5/100 57.1 | | | |
| 8Z0601027 03C | rally black | | | | |
3 | 8Z0601027A | Steel rim | 5Jx15 ET28 5/100 57.1 | | | |
| 8Z0601027A 03C | rally black | | | | |
5Jx15 ET28 5/100 57.1 steel rim 8Z0601027A (listed on Audi Tradition)
5.5Jx15 ET34 5/100 57.1 steel rim 8Z0601027 (listed on Audi Tradition)
The below original 5.5Jx15 ET34 alloy rim is still available new from places such as Audi Tradition. However, the price is very high.
Audi A2 original 15" alloy rim
1 | 8Z0601025A | Aluminium rim | 5.5Jx15 ET34 5/100 57.1 | | | |
| 8Z0601025A Z33 | burnished aluminium | | | | |
Audi Tradition are listing Pepperpots for 87.36 Euros each (about £74.75) plus shipping. However, Pepperpots come in two colours and the burnished silver colour is less popular than avus silver...hence why burnished silver is still available new and avus silver isn't (or at least expensive and difficult to find new).
Pepperpots 6Jx15 ET38 5/100 57.1 alloy rim 8L0601025D Z33 (burnished silver)
Pepperpots weigh a lot less than most other alloy rims that you might consider fitting to an A2, as they weigh an incredibly light 5.7kg. This is because they are a forged alloy lightweight design.
Pepperpots 6Jx15 ET38 5/100 57.1 alloy rim (from Audi A3)
3 | 8L0601025D | Aluminium rim | 6Jx15 ET38 5/100 57.1 | | | |
| 8L0601025D Z33 | burnished aluminium | | | | |
3 | 8L0601025E | Aluminium rim | 6Jx15 ET38 5/100 57.1 | | | |
| 8L0601025E Z17 | avus silver | | | | |
Hub cap for Pepperpots
9 | 8L0601165D | Hub cap | | | | |
| 8L0601165D 7ZJ | grey metallic | | | | |
Audi Tradition are listing the correct hub caps for the Pepperpots. These might also still be available new to order through VAG parts departments.
Hub cap for Pepperpots 8L0601165D 7ZJ