Author Topic: Dual disk front forks (Read 12148 times)

magicGoose · « **on:** August 18, 2005, 04:07:28 PM »

Is there anybody with a Euro spec 400 with dual discs who would be willing to take a couple of measurements for me? I need to know 2 things. First, do you have 41mm forks like the North American version, and secondly, what is the fork spacing. Any measurements for the fork spacing will be OK, like inside to inside, outside to outside, centre to centre, whatever.
I am looking into getting a dual disc setup, but I don't want to swap the triple tree because I have custom bars similar to the Suburban Machinery ones that I want to keep. Ideally if I can find a Suzuki with dual discs, 41mm fork tubes, and the same fork spacing, I will be able to slide in the new forks, add new calipers and rotors, and I'm set without futzing with wheel spacers and such.
Also, if anyone has done this, or tried it I would be interested to hear your thoughts.
Regards,
Steve

gsxr400 racer · « **Reply #1 on:** August 18, 2005, 04:12:27 PM »

A gsxr 400 gk73a has the front end you want as does that other bandit you said these share the same front end no tree replacement involved

magicGoose · « **Reply #2 on:** August 19, 2005, 12:34:06 PM »

Great, thanks for the info Racer!

Farre · « **Reply #3 on:** March 08, 2006, 09:52:30 AM »

is it possible to use a gsxr400 front end with the disc of a single? I'd like to convert to double discs, but i don't have the green to do it all at once.
I'm doubting about this, becuase i think i read somewhere the dual discs are smaller than the single disc type.
Ultimately, if the single kind fits on it, then it would be possible to fit 2 single discs on it, giving much greater braking, maybe overkill though..

Red01 · « **Reply #4 on:** March 08, 2006, 01:17:35 PM »

Alex, when you swap front ends, get a complete one, then you'll have all the parts to upgrade the forks and brakes at the same time.

magicGoose · « **Reply #5 on:** March 08, 2006, 02:14:39 PM »

Alex, if I understand correctly, you want to swap the forks but initially keep the B4 front wheel and rotor? I think the problem you will run into here is if the rotors are different sizes, the caliper mounts will not be in the right places and you will have to make adapter plates to make it fit.

Farre · « **Reply #6 on:** March 09, 2006, 03:49:43 AM »

Uhh, sorry Red01, i already have the gsxr forks at home, but i'm missing the rotors and the calipers.
MagicGoose: That is indeed what i would like to do... hmm, i was already worrying about that.. The wheel wouldn't be a problem, i've read elswhere that the only difference is just untapped holes on the other side. I should check one time the place of the caliper holes on both forks (b4 vs gsxr400), if there identical then i can place everything from the b4 onto it. The rest should fit, i don't see why not..

magicGoose · « **Reply #7 on:** March 09, 2006, 10:39:47 AM »

Alex,
I will be interested to hear about the caliper mounting. My stock calipers have the mounts really close together, different from any other Suzuki I have been able to find.
Another thing to think about is the axle and spacers. The Bandit axle threads into one fork leg, rather than having a nut like many other bikes. Is the GSXR the same? If not you will need a GSXR axle as well.
I have also read that Bandit wheels have unthreaded holes on one side, but mine does not have any holes at all on the side with no disc. Maybe this changes with the model years, mine is a 91.
Do you have older conventional GSXR forks and are keeping your triple trees, or do you have USD GSXR forks and will swap triple trees as well?
Steve

PitterB4 · « **Reply #8 on:** March 09, 2006, 11:11:36 AM »

Quote from: "magicGoose"

Alex,
I will be interested to hear about the caliper mounting. ..

Steve - if you read Alex's earlier post, he has GSXR400 forks. IIRC, they're very similar to the B4 (41mm conventional) but adjustable for preload and obviously are set up for dual disc brakes.

magicGoose · « **Reply #9 on:** March 09, 2006, 01:29:42 PM »

Uh... I THINK that he has a stock B4 and a set of GSXR400 forks that he wants to install while initially keeping his stock rotor, caliper and wheel. Later when he has the money he wants to install a second rotor and caliper. He is asking if his bandit caliper wheel and disk will fit up to his GSXR400 forks.
(or am I missing something here, as usual?)
Steve

PitterB4 · « **Reply #10 on:** March 09, 2006, 02:20:46 PM »

Sorry, my fault. When you asked about conventional v. USD, I thought you were thinking he had 750 forks or something. You got it right.

BTW Steve - do you have a plastic cover on the non-disc side of your wheel? I've never taken it off but Jay thinks the unthreaded holes are under there. I think Thief tapped and is using his stock wheel with his dual-disc Kat f/e. Yo Chris, were there holes on that side or did you have to drill it out b/f tapping?

Pic of plastic cover...

Farre · « **Reply #11 on:** March 09, 2006, 02:33:42 PM »

Exactly what MagicGoose said. I have the triple trees and forks.
I would like to use the gsxr triple trees as well, because in the accident in december it seems the stock has been bent a little.
The other questions you've asked made me a bit anxious... i don't remember if the axle system is the same or different, same about spacers..
About the unthreaded holes in the wheel, i've read in another thread it's hidden under a sort of strip. mine's also a '91

magicGoose · « **Reply #12 on:** March 09, 2006, 03:51:47 PM »

Rob,
Yeah, I have the plastic cover on the non-disc side. You can actually pop it off with a small screwdriver without removing the wheel or anything. It will move enough to see inside the hub. I have bosses where the holes would be, but no holes

Because of this, I bought a Katana front wheel for my upcoming dual disc conversion.
Alex,
I don't mean to rain on your parade here, it's just that I have been looking at this kind of stuff myself lately, and these are some of the problems I never foresaw. I am currently thinking about early GSXR750 forks ( because we don't have GSXR400s over here

) and the axle mounts are completely different.
Regards,
Steve

Red01 · « **Reply #13 on:** March 09, 2006, 05:36:46 PM »

With the GSXR forks, go with the GSXR wheel & brakes, so you get the entire front end assy.

Farre · « **Reply #14 on:** March 15, 2006, 05:28:49 PM »

just checked the forks i got here. axle is identical, but caliper mounts are different...Sooo, anybody got some discs and calipers for sale? No rush, though