chain set replacementent time

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fatboy
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chain set replacementent time

#1 Post by fatboy » Mon Mar 07, 2016 7:48 pm

So here we go again guys,
Im thinking of jumping up one tooth size on the front, pro's and cons ?
The ace thing about this site is the sheer bloody expierience you lot have so lets hear it !
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#2 Post by D-Rider » Tue Mar 08, 2016 9:12 am

Well that's an unusual way to go. The Falco will not pull max revs in top with the standard (16/41) gearing and going up a to a 17 tooth at the front will make that even more unachievable (not that you'll be wanting to do that anyway but it's really more of a measure of the suitability of the gearing of the bike).
Many of us tend to drop a tooth (15T) at the front to improve low speed drivability and/or to pep things up a bit.

Also, is there physically room for the chain run in the casing around the sprocket with a larger diameter front sprocket?
The other thing to remember is that in adding teeth, you need a longer chain so if you really want to lengthen the gearing I think you might be better off in taking teeth off of the rear sprocket (unless changing the chain at the same time).

Although it doesn't address the issues of a 17T front sprocket, years ago I did a bit of a comparison of common gearing options. I've included this for reference in case it's any help.
I have heard that there is really no difference in actual top speed with the 15t or 16t front sprocket as it can't really pull max revs with standard gearing and has a bit of an easier time with the 15t sprocket.
Never had it flat out in top so can't comment from actual experience. Even those that have been there will not have done so often so in my book it's an irrelevance.
The best thing about the 15:41 gearing (or 16:44 which is virtually identical) is the improved rideability round town - slow speed corners in particular.
A side effect is better acceleration - but it's not exactly lacking in that department anyway.
The advantage of going 15:41 is that you can use the same chain - if you go 16:44 you need a longer one.

Some people will tell you that the 16t sprocket gives the chain an easier life but the difference is so minimal it can frankly be ignored. Good chain maintenance (and scottoiler) will make a far greater difference.

I've previously posted this comparison I made but I'll post it here as well:
Falco Gearing – Comparison of 15/41 and 16/44 final ratios


Standard Gearing is 16/41

Max Chain Bend Radius and Angle Between Links

Standard 16t sprocket:
Bend radius (at chain pins) = 40.4mm
Angle between chain segments while on sprocket = 22.5 degrees
15t sprocket:
Bend radius (at chain pins) = 37.9mm
Angle between chain segments while on sprocket = 24 degrees

Comparison of Ratios:
16/41 gearing = 0.3902 (standard)
16/44 gearing = 0.3636
15/41 gearing = 0.3658

Compared to standard gearing:
16/44 gearing is a reduction of 6.82%
15/41 gearing is a reduction of 6.25%

Relative difference in Reduced Gearing Options:


The relative difference between 16/44 and 15/41 ratios is only:
1-(0.3636/0.3658) = 1- 0.9939
= 0.0060
or 0.6% different - so engine characteristics at any speed will essentially be identical.
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#3 Post by fatboy » Tue Mar 08, 2016 7:55 pm

Thanks for that, the joys of being dyslexic, up, down? left,right ? backward , forward ?
I knew where i wanted to be, just reading the map upside down,again.
It is so easy for me to invert clear logic, thats why I have to ask.
Oddly enough, if the task is involved i tend not to get it quite so wrong,, I will leave notes for myself, only to find the next day some of it is simply in reverse order.
Sometimes when a task needs to be done from lying on the ground and looking upward then clockwise becomes anti clockwise, sometimes I have to walk away and draw a diagram, re draw it showing land and sky and it can still be really hard for me to absorb.
If that doesn't make sens then welcome to my world :smt009
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#4 Post by D-Rider » Wed Mar 09, 2016 8:02 am

No worries :smt003

So I'm assuming from that you are considering dropping to a 15T front sprocket.

Do it !

:smt004
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#5 Post by fatboy » Wed Mar 09, 2016 7:30 pm

Thanks D-R, some days I can think without any alien interfereance, some days not.
15 t it is then :smt002
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#6 Post by fatboy » Thu Mar 10, 2016 7:39 pm

15 T front ordered along with DID chainset, last week in March on holiday so sorry nieghbours, the SL cans will be barking again soon :smt003
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