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05-30-2015, 03:14 PM,
#16
RE: Gear ratio?
(05-30-2015, 03:03 PM)Handy Andy Wrote: Is there a reason you can not just go with an 18 tooth front sprocket and not change the rear one? Seems it would effect the speed similarly.

Yes,you can.
You can but I went wanted something a little more radical.
Bike : 2009 V Star 250
You can put a bowling ball in an oven, but that don't make it a biscuit.
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05-31-2015, 11:32 AM,
#17
RE: Gear ratio?
I just did a little math problem, divided 45 by 16 = 2.81 . Divided 45 by 18 = 2.5 . Divided 38 by 17 = 2.23 so you could put on a 18 tooth sprocket and get you half way to the high speed 17 tooth front sprocket and the 38 tooth rear sprocket. 18 tooth with a 40 tooth rear would give you 2.22. Several ways to go.
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05-31-2015, 09:45 PM,
#18
RE: Gear ratio?
Before I bought my 650 I was seriously considering (as in actively looking for) a V* 250 so I did a lot of research on changing ratios. (BTW, I'm REALLY glad I let the folks here talk me up to a 650 and am now considering something larger but that's a 'nuther story.)

Anyway, the bottom line is that there is more to consider than just the number of teeth on each gear. Ever wonder why the manufacturer settles on the sprockets they do? After all, they're making (or having made) the sprockets so they could select anything they want. The "approach" and "departure" angles of the chain to the sprocket have an impact on how efficient the drive train is and on how long chains and sprockets tend to last, as does the steepness of the "pitch" around the tensioned part of the chain wrapped around the sprocket.

The even more sensible reason to go up on one sprocket and down on the other is that you don't have to change the chain length.

I.e., if you change a total of one tooth you have to adjust the chain tensioner to compensate. If you change a total of two teeth but do it on one sprocket you will have to change the number of lengths in the chain (there isn't generally enough room on the tensioner to compensate). If you change two teeth, but do it with by decreasing one on one sprocket and increasing one on the other sprocket, the chain doesn't need to be adjusted at all.

HTH,
John
===========================
2011 V-Star 650 Custom (new in fall 2013)
V&H Cruzer Pipes, Memphis Shades Bat Wing, Floorboards, Highway Bars,
Locking Bags, Tail Rack, LED Signals & Aux Brake Lights, Headlight Modulator,
Brake Light Modulator, 5/8" Gel Pad Under Upholstery.
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07-10-2015, 07:57 AM,
#19
RE: Gear ratio?
(11-16-2012, 10:39 PM)kenzies_dad Wrote: Just curious, what do you run for gear ratios/sprockets? Right now I'm running the stock gears on my '12, but I would like to get a little more on the top end, plus I would like to be able to go through the intersection and not be banging gears the whole way. I mean I'm in third by the time I'm across, so I guess I just want to spread my gears out a bit. Any ideas? Experience? Recommendations?

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I think this thread is very informative and will help a lot of riders on here both new and old.
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09-03-2016, 11:54 PM, (This post was last modified: 12-14-2016, 10:16 PM by bfrench.)
#20
RE: Gear ratio?
I know this is an old thread but have any of the original posters still have your bikes and have any others made the gear swap?
It would be nice to have an update from people who have done this and have put some miles on the bikes.
I get my (new to me 250) around mid - Oct and plan to do this change - it really makes me happy to do something that will increase mpg and not affect the bottom end very much - I'm planning on 17 / 40.

I used the Gearing Commander site today and found it quite useful to compare several ratios at once - here's a sample of the results.

http://www.gearingcommander.com/


Speed in miles per hour


16 / 45 - Standard gear ratio


RPM 0 800 1600 2400 3200 4000 4800 5600 6400 7200 8000


Gear


1st 0 2.48 4.95 7.43 9.91 12.39 14.86 17.34 19.82 22.29 24.77


2sd 0 3.89 7.77 11.66 15.55 19.43 23.32 27.21 31.10 34.98 38.87


3rd 0 5.19 10.38 15.58 20.77 25.96 31.15 36.34 41.54 46.73 51.92


4th 0 6.55 13.09 19.64 26.19 32.73 39.28 45.82 52.37 58.92 65.46


5th 0 7.97 15.94 23.91 31.88 39.85 47.82 55.79 63.76 71.73 79.70





17 / 43 Custom gear ratio


RPM 0 800 1600 2400 3200 4000 4800 5600 6400 7200 8000


Gear


1st 0 2.75 5.51 8.26 11.02 13.77 16.53 19.28 22.03 24.79 27.54


2sd 0 4.32 8.64 12.97 17.29 21.61 25.93 30.25 34.58 38.90 43.22


3rd 0 5.77 11.55 17.32 23.09 28.87 34.64 40.41 46.18 51.96 57.73


4th 0 7.28 14.56 21.84 29.12 36.40 43.67 50.95 58.23 65.51 72.79


5th 0 8.86 17.72 26.58 35.45 44.31 53.17 62.03 70.89 79.75 88.61





17 / 40 Custom gear ratio


RPM 0 800 1600 2400 3200 4000 4800 5600 6400 7200 8000


Gear


1st 0 2.96 5.92 8.88 11.84 14.80 17.76 20.73 23.69 26.65 29.61


2sd 0 4.65 9.29 13.94 18.58 23.23 27.88 32.52 37.17 41.81 46.46


3rd 0 6.21 12.41 18.62 24.82 31.03 37.24 43.44 49.65 55.85 62.06


4th 0 7.82 15.65 23.47 31.30 39.12 46.95 54.77 62.60 70.42 78.25


5th 0 9.53 19.05 28.58 38.10 47.63 57.16 66.68 76.21 85.73 95.26
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