Need fork leg help! 907ie.

discussions specific to the 907IE
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Sycklemotor
Posts: 16
Joined: Tue Oct 28, 2014 1:36 pm
model: 907 I.E.
year: 1991
Location: USA

Need fork leg help! 907ie.

Post by Sycklemotor »

Can anyone tell me if the 1991 fork legs are different from the 1992 on the 907ie?
The bolts are 40mm apart, but is the location of the lug different?
I have purchased 320mm rotors as well as new P34 Brembo gold calipers .Took a quick fit up without my wheel and it looked like they will work with my fork legs. ( My wheels are at the powder coater until the weekend.)
If you have a 1992 ,could you measure the location of the lugs for me? I would greatly appreciate it.
Thanks in advance.
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ducinthebay
paso grand pooh-bah
Posts: 1323
Joined: Sat Sep 03, 2005 12:00 am
model: 750 Sport
year: 1990
Location: SF Bay Area

Re: Need fork leg help! 907ie.

Post by ducinthebay »

The answer is "probably".
The 1991 had 300 mm rotors, and the 1992-3 had 320mm rotors. Same wheels, and sometimes same calipers (black or gold) So yes, there are two different fork legs. No obvious visual differences.

Cheers, Phil
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
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Derek
paso grand pooh-bah
Posts: 768
Joined: Thu Nov 03, 2011 10:13 am
model: 907 I.E.
year: 1994
Location: Scotland

Re: Need fork leg help! 907ie.

Post by Derek »

I have a 93 model with 320mm discs. As near as I can measure, the distance from the bottom of the fork leg to the centre of the lower caliper lug is 145mm.
1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL (now sold)


Scotland
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Revhead
Posts: 10
Joined: Sun Feb 09, 2014 8:24 pm
model: 907 I.E.
year: 1992
Location: Netherlands

Re: Need fork leg help! 907ie.

Post by Revhead »

With both a '91 and a '92 in the garage, it is easy to compare. The results are:

'91
Distance from centre of axle to bottom calliper lug: 110 mm
'92
Distance from centre of axle to bottom calliper lug: 120 mm

It does make sense as the brake discs on the '92 are 20 mm bigger diameter, so 10 mm larger radius...

Sorry buddy, but they are not the same for exactly this reason...
If it ain't broke, don't fix it. Modify it!
Sycklemotor
Posts: 16
Joined: Tue Oct 28, 2014 1:36 pm
model: 907 I.E.
year: 1991
Location: USA

Re: Need fork leg help! 907ie.

Post by Sycklemotor »

Thanks for all of the replies and assistance. It has helped as I work through this. I am amazed at how small the 907 community is. There is so little info on the web to work with. I am a licensed Ducati mechanic and will help try to provide as much info from my experiences with my 907 as possible to help others.
I am going to use the Brembo Goldline ( P4 3--34 with 40mm spacing)) calipers that I purchased from Bevel Heaven along with Brake Tech Axis Iron 320mm rotors that I purchased from Chris Kelly at California Cycle works.I had a set of 1992 forks purchased from EBAY but when they showed up someone had ground the caliper mounting lugs at some point ( who knows why) and rendered them useless, so I sent them back for a refund.I am now looking for a set of lower fork legs to make this work out.In the meantime I will be using 300mm EBC Pro-Lite rotors so I can at least ride the bike.
After I get the forks I need I will switch over to different pads and the Iron rotors.
I have re-powdercoated my wheels as when I purchased the bike the PO had done a lousy job on them. I have also reworked the rear cush drive with Titanium pins from TPO parts as well as new cush lugs and Supersprox sprockets with machined 90 degree valve stems.
I have also upgraded to a Nissin Radial pump master cylinder with 5/8 piston.
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