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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 3rd January 2011
Donnie1966 Donnie1966 is offline
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Default how do i get more top end speed on my 79 iron

What sprocket setup should i use to get more top end speed on my 79 ironhead size sprocket front and back???????????
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  #2  
Old 3rd January 2011
Donnie1966 Donnie1966 is offline
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Thanks everyone need all the help i can get.....
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  #3  
Old 3rd January 2011
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A 23 tooth gearbox sprocket is good for the open road, and stills give good take off from the lights etc. It is quite popular with many on here.

If you want any higher than that, you can go from the stock 51 to a 48 tooth on the rear as well.
But I would try the 23/51 combo first.
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Old 3rd January 2011
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Quote:
Originally Posted by hopper View Post
... I would try the 23/51 combo first.
+1
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Old 4th January 2011
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23/48 is good for hiway riding
23/47 is real good for the freeways (avoid passengers though)
22/48 is pretty good all around riding especially if you have hills and mountains
21/48 (stock on many years in the 80's) is just a little quicker
remember that more top speed will mean less acceleration; more rpm on the hiway is the price for quickness.
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Old 4th January 2011
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Default I run the tried & true 23/51 combo on my '74...

...and it's FANTASTIC up on the highway.
It'll get the RPMs down enough to make riding comfortable for hours, but still leave enough guts for passing semis and shooting up on-ramps.
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Old 4th January 2011
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Well, I don't think a 23 tooth front sprocket will necessarily get you more top speed...it just makes those higher speeds more bearable, especially on the highway as Ivan says. According to my tach, if my bike would pull redline in 4th gear with the 23/49 setup I run, it would top out at about 130 mph, but I don't think the motor can pull redline with gearing that high - not enough hp and/or streamlining.
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Old 4th January 2011
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i was gonna comment on that too. it would be neet to find the optimal gear for the highest top speed these bikes could pull stock probably close to 20/48 or 21/48. 22 48 works fine as an all around gear for me.
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Old 4th January 2011
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Big long steep down hills, always work for me.

Art
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  #10  
Old 4th January 2011
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tie a rope on a semi and put it in neutral... nice and smooooooth. No really, I use the 23-51, brings the rpm down a little but still fun to go screaming by the old farts on thier baggers at a buck!
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