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Cruisers - America, Speedmaster Cruiser chat for America and Speedmasters

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Old 11-09-2012, 05:45 PM   #1 (permalink)
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Front Sprocket Change

I should have done this way before now ! For the past couple of years, every time I get on the highway at cruising speeds of around 65 and higher, I feel like I need a sixth gear. The engine just sounds way to wound up to me. At any rate, I kept reading about going to a different front sprocket and how much better it is at highway speeds. I changed the 17 tooth front sprocket to an 18 and WOW - what a difference. I can't believe the difference. I almost went to a 19 and the place that works on my bike convinced me an 18 would be perfect. They were right.

My days of racing from red light to red light are long over, but honestly, I can't even tell the difference in the low end - it still pulls like a freight train - at least plenty enough for me.

I only wish I'd done this a couple of years ago instead of waiting. This was probably the best $50 I've spent on the SM ( $ 20 on sprocket and $30 to have it put in - I know I could have done it myself ! )

I noted the RPM's with the 17 going around 60 was right at 4000 -- with the 18 it was just under 3500 -- now when I'm in 4th gear, it feels like 5th and in 5th going 65-70 - it so much darn smoother, it's like having a new bike ! Yep, I'm happy !
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Last edited by proimage1; 11-09-2012 at 06:19 PM.
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Old 11-10-2012, 08:56 AM   #2 (permalink)
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pro, glad the sprocket change worked out good for you. I actually did the opposite (18T to 17T) and am very happy. Could be due to small difference in the 790cc & 865cc set ups. Most of my time is spent in the 35-65 MPH range but the motor feels good running 4500 RPM on the interstate and lost no speed on the top end, only a couple of RPM.
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Old 11-10-2012, 03:25 PM   #3 (permalink)
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I thought I read somewhere that the standard on the new bikes was an 18 - at any rate, the 18 is perfect for me.

I still long for 6th gear - darn, I guess I'll just have to buy that new Thunderbird now ! ROFL !!!


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Old 11-10-2012, 03:50 PM   #4 (permalink)
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Originally Posted by MattyMo View Post
I actually did the opposite (18T to 17T) and am very happy.
Same here, and it's it much better for me. A lot depends on the sort of riding you do.
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Old 11-10-2012, 07:09 PM   #5 (permalink)
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Same here, and it's it much better for me. A lot depends on the sort of riding you do.
You are right -- those days of blasting around as fast as I can go are over. Honestly, I don't even enjoy riding that way now. Whenever I ride with my son - he leaves me in his dust ! I'm 58 now and I'd much rather slow down and enjoy the ride and scenery.

The 18 tooth front sprocket is perfect in my opinion - I only wish I hadn't waited so long to change it !
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Old 12-02-2012, 05:45 AM   #6 (permalink)
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Hey Pro, I changed to 19t (from 18 stock) on my 09 speedy recently for a trip to the Snowy Mountains down under in Oz. worked great for me on our freeways max speed limit being 110km/hr. fully laden averaged 21km/ltr. At 100km/hr only reving @ 3100rpm.. A good move IMHO.
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Old 12-02-2012, 08:50 AM   #7 (permalink)
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18 tooth is sort of universal good in town and good on motorway(highway) when I was riding to Poland and back to UK few times, mostly motorways always was using 19 tooth one
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Old 01-04-2013, 01:49 PM   #8 (permalink)
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I change to a 40 in the rear was a 42 you don't have to do anything to your chain. I also have a 18 front much better on the highway. Use this website http://gearingcommander.com/ for gearing changes works well to let you know what the change will be. Put in correct info first on your bike.
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Old 01-04-2013, 08:01 PM   #9 (permalink)
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I went to Largest front (19) and smallest rear (47 ? Or whatever ) and bike still pulls Great and I can still Cruise !

Was on a charity run with mostly harleys (bikers for babys , kcmo)

And a bud on a 98" hd streatched it out on a deserted Long straight way on us hwy 24 !

We were Both Doing over 120 mph side by side when we pasted a state trooper WHO shook his finger at us !

We slowed down to near speed limit and trooper never moved ! Lol
But all in all , I love the gear ratio !

Mine is an 05 btw
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