Have just bought a post mount fork and need to fit my existing brakes, which are Magura Marta SL IS calliper with 160mm disc.

I have seen an adaptor on CRC that states "to mount a 74mm post mount caliper to a 51mm International Standard fork mount to accomodate a 160mm disc", but this is the wrong way round for me.

Cant work out whether I could still use this though, or if I need a different adaptor…?

If the latter, can anyone point me in the direction of the correct adaptor and where to buy?

Many thanks.

You may have to go +20mm.

I don't think a straight post to IS 160mm exists

One of these
But you will need to go +20mm on your rotor size.
Out of stock, but Hope stuff is available from everywhere!

Thanks for the advice – so it looks like I dont need a Magura specific adaptor, but will need to swap my 160 rotor for a 180…?

http://www.bonthronebikes.co.uk/166-432216
http://www.wiggle.co.uk/p/cycle/7/A2Z_Adapter_IS_to_PM_To_Keep_160mm/5360033036/

Yes, you'll need to go up 20mm to the bigger rotor – you'll not get a 160mm adaptor that'll fit for your combo alas.

Don't get the A2Z Keep 160 Adaptor. It doesn't work. I got one last week, but fortunately Wiggle are very good with their returns. I have now fitted them using a Hope +20 adaptor. This was for fitting old Hayes Sole onto a Manitou Drake (on a Hard Rock Sport).