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DB5 number of teeth

 
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bimototo



Joined: 03 Jan 2012
Posts: 161
Location: between Imola Mugello and Misano

PostPosted: Tue Jun 20, 2017 10:56 am    Post subject: DB5 number of teeth Reply with quote

Hi all,
Could you please help me, I need to know the stock number of teeth (both front a d rear sprocket) of the various model of db5.
And if someone have change the front sprocket, I need to know if a 16 teeth can fit.
Thanks
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2bims



Joined: 03 Apr 2010
Posts: 4500

PostPosted: Wed Jun 21, 2017 12:54 pm    Post subject: Reply with quote

The early Mille and DB5R versions had a 15 tooth sprocket up front and a 38 on the rear....according to the spare parts manuals...Theres not that much space around the front sprocket so maybe better and easier to go down on the rear if you want to change the gearing
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bimototo



Joined: 03 Jan 2012
Posts: 161
Location: between Imola Mugello and Misano

PostPosted: Wed Jun 21, 2017 2:05 pm    Post subject: Reply with quote

Hi!
My problem is space. I have to pot some distance between chain and swingarm on my db4 with 1100ds engine.
I've seen that st4 can put 16teeth front sprocket. I think can fit but not 100% sure...
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quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Jun 21, 2017 3:31 pm    Post subject: Reply with quote

Why do you need more distance between the chain and swingarm? What size front and rear sprockets do you have on the bike now?

What 2Bims posted is correct re: the clearance. If you go too large, you will either have fitment issues or the chain, primarily during deceleration, will climb up the front sprocket a bit and could impact the engine case...which is VERY BAD!

In any case, you should invest in a stainless steel case saver insert from someone like Corse Dynamics seen in this link. I am adding these to the DB6 and 1198 as I have had a chain come off at speed before. Scary!!!

http://motowheels.com/i-8328068-corse-dynamics-ducati-stainless-steel-case-saver-chain-guard.html
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quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Jun 21, 2017 3:34 pm    Post subject: Reply with quote

BTW, typical Ducati final drive gearing is 15/38 or 15/39 or at least that is what I have found over many years and models. A lot of people have gone to 15/41, which gives a bit more low-end grunt (and makes it easier to do 1st through 3rd gear power wheelies... Laughing )
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2bims



Joined: 03 Apr 2010
Posts: 4500

PostPosted: Wed Jun 21, 2017 3:48 pm    Post subject: Reply with quote

bimototo wrote:
Hi!
My problem is space. I have to pot some distance between chain and swingarm on my db4 with 1100ds engine.
I've seen that st4 can put 16teeth front sprocket. I think can fit but not 100% sure...


Ah...Okay.....I was forgetting its you that's fitting basically a DB5 1000cc engine into a DB4 frame and swinging arm....

First things first...which may well dictate your choice of front sprocket.....

CHAIN ALIGNMENT - DB2, DB3 and DB4 all used a special Bimota only offset front sprocket...bringing it out an extra 2.5mm to align with the rear sprocket...and using a special retaining clip also...basically the front sprocket is recessed on the front face by some 2.5mm with a recessed Top hat retaining cover and 2 bolts......Basically due to bespoke frames and off the shelf wheels and engines...Bimota aligned the wheels front and rear....then designed a front sprocket to achieve correct chain alignment with the rear sprocket....A standard Ducati front sprocket will fit...but it will eat alive your rear sprocket in no time at all. I think...but am unsure...that DB5 and DB6 use standard front sprockets.....Have you had to play with/adjust the spacers on the rear of the engine mounts to frame?....same sized alloy spacers one each side?......if kept the same with new engine then Bimota sprocket would be needed...only come in certain sizes...from Wieres in Germany......So...I would set up front and rear wheels to align...then check chain alignment and see if you need a special front sprocket first...as this will dictate your choice
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bimototo



Joined: 03 Jan 2012
Posts: 161
Location: between Imola Mugello and Misano

PostPosted: Wed Jun 21, 2017 7:36 pm    Post subject: Reply with quote

I've also new wheels, I have to align everything from zero, I have also the possibility to work an old front sprocket for have a good spacer, then fix everything with stock ducati nut.
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Thu Jun 22, 2017 9:56 pm    Post subject: Reply with quote

15/41 is a very good combo for a stock or tuned 1100 engine for sporty driving or trackdays. 16/43 or 16/44 is similar if you need the clearance. 16 have been used on my engine when it visit Mugello with the long straight n combination with a short ratio gearbox. Note that it is a removable spacer behind the front sprocket that can be tailor made to suit the required position of the sprocket since you also have the nut.
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Monster 1100 -96 for the road / 1100SS for the track / DB4 new track project
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bimototo



Joined: 03 Jan 2012
Posts: 161
Location: between Imola Mugello and Misano

PostPosted: Fri Jun 23, 2017 12:32 am    Post subject: Reply with quote

So you confirm that 16 can fit with no issue at all?

Great!
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quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Mon Jun 26, 2017 10:01 pm    Post subject: Reply with quote

Leave it to Bimota to also have to make this simple part custom for some bikes. Rolling Eyes
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