Need rim info for 1975 Ducati 860GT

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rjk40
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Need rim info for 1975 Ducati 860GT

Post by rjk40 » Thu May 19, 2016 9:05 am

Hi All,

Restoring 1975 Ducati 860GT, kick start only, lost track of the old corroded chromed steel spoked rims. Front hub is disc brake 40 spoke, two angles for the 40 spokes, rear hub is drum brake, also 40 spokes, two angles for the 40 spokes.

Would like to know what the best choice of rim is; my only source is the Haynes shop manual, which does not specifically cover the rim size for the 1975 860GT, only shows all having 3.50" wide rims front and rear, with Metzler tires.

Any suggestions will be appreciated. Plans are to send the hubs to Buchanan in Azusa, California and use Excel rims, but am not sure of:
1. Shouldered vs non-shouldered
2. Deep vs shallow dimples
3. Rim width.

Thanks in advance.
Regards,
Richard Kovach
Malabar, Florida

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BevHevSteve
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Re: Need rim info for 1975 Ducati 860GT

Post by BevHevSteve » Thu May 19, 2016 4:16 pm

Hi Richard,

2.15 x 18 front and back
or
2.15 x 18 front and 2.50 x 18 back
*MAX*

Larger rims require larger tires which slow steering down on these bikes and ruins the handling. Bigger is not really better.

Your bike most likely came with 2.15 both front and back (or 1.85 F and 2.15 R).

if you get shouldered rims, they look cool, and look like the Borrani rims, but, know that every time you wash your bike or it gets wet etc, water will pool on your rim at the 6:00 position. Pain in the butt. Just know that going into it.

I prefer the excel rims to be polished with a clear coat. The clear coat protects the rims and makes cleaning them 100% easier and faster. Also, the clear coat will give it a very slight satin finish, but, your 'polished' rims will look worse than that the first time you wipe a rag on them to clean so why not make life easy and keep things looking a good as possible?
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rjk40
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Re: Need rim info for 1975 Ducati 860GT

Post by rjk40 » Wed Jun 08, 2016 8:06 am

Hi Steve,

Thanks kindly for the info.

One question still remains:

Shallow or deep dimples on the rims?

Regards,
Richard

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BevHevSteve
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Re: Need rim info for 1975 Ducati 860GT

Post by BevHevSteve » Wed Jun 08, 2016 11:05 am

I don't understand the question. Yes there are dimples, I have no idea who tall they actually are.
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Vince
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Re: Need rim info for 1975 Ducati 860GT

Post by Vince » Mon Jun 13, 2016 4:23 pm

Proper original Borani rims on my Laverda especially the rear with the very large twin leader brake had bigger dimples to allow the correct spoke drilling angle to suit the more complicated lace pattern , the resently made Borani copy's have a smaller dimple that compromises this. Dont know if this effects the simpler lace pattern or smaller hubs on disc brake wheels or rear hubs with the simple lace pattern used. This caught me out when I swapped to a bigger new type rear rim.

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