Yup. When I did mine,the ZX9R were the longest Jap forks around. Dont know what the situation is now though and once you get into Euro bikes there could be a whole slew of possibilities.
I went with the ZX9R forks and to keep things (reasonably) simple, I went with yokes,wheel and brakes as well.The complete front end.Some people mix and match but then you're getting into a whole new world on engineering and expense.I was fitting onto a CSR1000 from '81ish. I just needed a new stem on the lower yoke(some people press in the old one) new bearings of course and I had to weld a couple of blobs either side of the steering stop to avoid hitting the tank when turning. Visually,I made a new front mudguard as the ZXR one looked out of place.
Once everything was together,it all worked great considering I made no calculations for rake and trail.Maybe I just got lucky but is handles and steers fine. Mind you,I drive like an old lady anyway.
The clearance on the exhaust downpipes was a problem though.Other people have got away with it but maybe because I started with a cruiser,I had less height to begin with. I ended up having some fork extensions made up locally.I went with the max which was about 5cms,I think.( there are dimples in the ZXR forks and you can only extend so far before the lower yoke needs a sleeve.) this gives me enough clearance on the exhaust and some extension to spare.
Its all in the build thread.Somewhere!!
Would I do it again??? Dont know!! I do like the Triumph forks previously mentioned.
P.S.I do remember that there is a chart out the somewhere with fork lengths and diameters.God knows where.It was a long time ago. Someone must have it.
P.P.S Aha! Just found this;
www.caferacer.net/threads/triple-tree-an...version-chart.14059/