sprocket
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Joined: Aug 2009
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sprocket
The rear sprocket on my 76 FLH is trashed along with the chain. So i am going to order new. My ride only likes about 65mph. Interstate speed might not be so bad some times. Any suggestions on front and rear sprocket sizes or should it be left alone. 5 speed trans are spendy so i thought a few more mph with the gearing maybe easier.
Also any suggestion on where to get a good chain and sprockets.....
Thanks
Also any suggestion on where to get a good chain and sprockets.....
Thanks
Outstanding HDF Member
Joined: Apr 2008
Posts: 3,140
Likes: 17
From: Wisconsin
I believe stock was 23/51, at least on the FX, the FL may even be 22/51. I run a 25/51 setup on the FX, it cruises at 80 but it's hard pulling from a dead stop. I've tried 23/51 with close to the same results. I'm thinking I might go back to 24/51 this winter, a little higher RPM on the highway, a little more pull from the stop.
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Joined: Jul 2008
Posts: 481
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From: Bgosh,WI
I'm running 22/47 on my FLH, it was suggested by my Indy, just breaking in the motor so I haven't got a feel on the Free way yet. Its set to run around 3k at 70. Factory was 22/51 but in 1978 the max was 55 limit. Don't remember what I changed my Lowrider too. Even with a 22T, if the chain gets loose it saws the inner Prim, so anything bigger you really gotta watch.
Try this:
Sprocket Ratio’s = RPM’s
It's simple to figure out:
1) Engine sprocket 24 t, clutch sprocket 37 t, 37/24 = 1.54 (std Primary)
2) Tranny sprocket 23 t, wheel sprocket 49 t, 49/23 = 2.13
1.54 x 2.13 = 3.28 final ratio.
If you have a 130/90-16-rear tire use the number 800.
(800 wheel revolutions in 1 mi) (63360 inches = 1 mi)
3) 800 x 75mph = 60,000 per hr
(Wheel revolutions in 1 hr)
60,000 / 60 minutes per hour = 1000
(1,000 revolutions in1 min)
4) 1000 x 3.28 final ratio = 3280 RPM
Try this:
Sprocket Ratio’s = RPM’s
It's simple to figure out:
1) Engine sprocket 24 t, clutch sprocket 37 t, 37/24 = 1.54 (std Primary)
2) Tranny sprocket 23 t, wheel sprocket 49 t, 49/23 = 2.13
1.54 x 2.13 = 3.28 final ratio.
If you have a 130/90-16-rear tire use the number 800.
(800 wheel revolutions in 1 mi) (63360 inches = 1 mi)
3) 800 x 75mph = 60,000 per hr
(Wheel revolutions in 1 hr)
60,000 / 60 minutes per hour = 1000
(1,000 revolutions in1 min)
4) 1000 x 3.28 final ratio = 3280 RPM
Last edited by 78fxs78; Sep 30, 2009 at 10:27 PM.
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thanks, 23/49 dont pull hard from the start? i like the thought of more speed with less rpm but just wondering how that set up runs out as far as having power for hills or passing..... guess what i am asking is is it better than the stock set up because on mine there is nothing in 4th gear
Cruiser
Joined: Sep 2009
Posts: 154
Likes: 2
From: san diego ca
Interesting solutions to your problem, or concern..The sprocket combination is costly time wise deal..If monies are kewl, look into changing the gearing in the tranny, You can get close ratio bottom end then space out at the top..It's hard to get it all with a 4 speed..Beuna seurte hombre..1904;Ruben
I usually push my slab up to 65+ and stay there, she likes it there..
I usually push my slab up to 65+ and stay there, she likes it there..
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Road Warrior
Joined: Aug 2008
Posts: 1,306
Likes: 864
From: Sheboygan, WI
just read more closely at your first post, and just an FYI you will get no more top end with a 5 speed than with a 4 speed. The final drive ratio is the same, most guys like their 5 speeds because they can gear up and not lose anything on the bottom because there are more gears to choose from. You don't get an overdrive in the trans until you go to a 6 speed. Also, as far as the chain and sprockets go, i'd avoid the taiwan ted versions, and I can't say i've heard anything good about the Diamond chains either. Get something made in the US of A or Japan and chances are you'll be happier with it.
Last edited by d_slat; Oct 5, 2009 at 11:35 AM.
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Joined: Apr 2009
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From: Daytona Beach
thanks, 23/49 dont pull hard from the start? i like the thought of more speed with less rpm but just wondering how that set up runs out as far as having power for hills or passing..... guess what i am asking is is it better than the stock set up because on mine there is nothing in 4th gear
andygears