13's are definitely do-able. Even the stock ZX caliper will clear about 50% of the decent 13" wheels available out there.edakotaford wrote:great discussion, thank you all for the input! I have been doing datsuns for about a decade now, and have exclusively used ZX front struts with factory brakes. This time round on my build i would like to have modern braking power, whilst hopefully maintaining use of vintage aftermarket JDM 14" wheels. 13's if possible, but the likelihood of installing modern brakes and still fitting 13's my guess is unlikely.
I used the Willwood Mini GBN calipers on my ZX struts, and they clea7 my 13x7 Libra's (no spacers) with about 1/4" to spare.