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Reload this Page '04 749S - lowered gearing?
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  #11  
Old 31-May-2004, 08:56 AM
yellowisfriedegg yellowisfriedegg is offline
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Originally posted by jk2
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Originally posted by yellowisfriedegg
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Originally posted by Twinfan
Cheers. Anyone dropped one at the front on an '04 749S? Is it worthwhile?

I went down 1 at the front and 1 up at the rear on my 999S , noticably quicker acceleration , reduced top speed by 5-10 mph though.

I intend doing the same on the 749R , I'm just waiting for sprockets


I have a 999s, with 1 tooth less on the fr sprocket, how much more difference does going up one on the rear make? Any problems with chain length?

One down at the front and 1 up at the back is the equivalent of 3 (and a bit) up at the back , the advantage being you do not need a new chain to do it where you probably would have to replace the chain too if you just altered the rear sprocket.

In reply to Shazzams post , I will check the front sprocket on Mrs eggs 749S when I get home for number of teeth , I thought it was a 15 front standard so going down to a 14 is not an issue , I do know without checking though that ALL 749's and 999's come fitted with 525 chain and sprockets as standard.

[Edited on 31-5-2004 by yellowisfriedegg]
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  #12  
Old 31-May-2004, 03:23 PM
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You're right, I had forgotten that the 749s get 525 chains. Probably more for parts standardization than for strength requirements. I remember from the product introduction that that was one of the major design objectives of the new models.
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  #13  
Old 31-May-2004, 04:11 PM
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According to the info I have here all the 749's have a 14T front. 13T are like hens teeth and run the chain too tight. Only real world alternative is to up the rear. 3T is a good start, and you may get away with the standard chain?
Both Renthal and STM do alloy real sprockets for them now. Rentha are about 25, the STM 58 but are real works of art
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Old 04-Jun-2004, 09:36 PM
electricsheep electricsheep is offline
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Looking at ducati.com (not sure if this is accurate)

749S has 14F 39R with primary drive 1,84 (is this 1.84:1 ? )
749R has 15F 35R with primary drive 2,11

I not sure which way the maths goes, so which has taller gearing ?

Rob
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  #15  
Old 05-Jun-2004, 08:07 AM
749R 749R is offline
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If it's any help, I went up 3 teeth on the back, the gearing is spot on now and still using the standard chain.

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  #16  
Old 05-Jun-2004, 08:24 AM
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When you say still using the std chain to get an extra 3 teeth in. How much did you move the rear wheel forward then? which mark are you on on the swingarm? Any piccies?
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  #17  
Old 05-Jun-2004, 03:01 PM
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749R, going from a 15/35 to a 15/38 using the same chain will shorten your wheelbase 12mm. In general, it's better to go to a longer wheelbase than a shorter wheelbase because it improves high speed handling. Superbike corsa swingarms, for example, are 15mm - 25mm longer than street versions for this reason. Shortening the wheelbase beyond the stock setting is really not a good idea.

A good approach gearing is to set the wheelbase at maximum (still allowing the adjuster an additional 10mm for chain stretch) and then use a combination of sprockets and chain length to shorten the gearing.

The length of each link from pin-to-pin for a 5XX chain is 5/8-inch (16mm.) So in your case of using a 15/38, if you use the next longer length (adding two links at a time) youll get a wheelbase 4mm longer than stock instead of 12mm shorter. Id do it.
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Old 05-Jun-2004, 03:56 PM
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  #19  
Old 05-Jun-2004, 04:02 PM
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Old 05-Jun-2004, 04:29 PM
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