I'm purchasing 2 sets of adapters 1x 5x100-5x112- 15m and 1x set of 5x100- 5112- 25m.......... Will I need longer bolts for my wheels?

Cheers

They are adapters so no mate

Do you mean spacers? Assuming you've got multifitting ones.

I might be confused but i thought as there adapters the bolts which keep the alloys on would need to be longer as its pushing it out more?? no not spacers

Ur changing the pcd so the adaptors will bolt to the hub then the wheel bolts to the adaptor. .

5x112 is bmw/merc fitment ain't it

As said, the adapter bolts to the hub, then you bolt the wheel to the adapter, using 2 sets of bolts all together. 5x112 is MK2 octy/mk5 golf?

Anyway, regards to your question, you won't need longer ones, quite possibly shorter ones though on the 15mm adapters because they'll bottom out.