39-tooth sprocket? - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 14 (permalink) Old 01-01-2007, 01:25 AM Thread Starter
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39-tooth sprocket?

I keep running across references to a 39-tooth sprocket. I'm getting my '03 750 ACE ready for a long (10,000 mile) road trip in the spring. What's the deal with this sprocket? How will it effect my performance?


I've been off bikes for 20 years, and finally back on the road with a lovely '03 Shadow 750 ACE Planning a major road trip through the U.S. next Spring. Interested in tips re bike camping in Western U.S.
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post #2 of 14 (permalink) Old 01-01-2007, 02:39 AM
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A 39 tooth sprocket will lower your rpms on the highway making for a much more pleasant ride. You will lose a bit of low end. It's hardly noticable with a 39. From what I've seen a 38 tooth seems most popular. It will lower your rpms a bit more than a 39. Many on this forum use a 37 tooth.

The smaller your rear sprocket, the lower your rpms will be on the highway. The smaller your rear sprocket, the less off the line acceleration you'll have. You may have to slip your clutch a bit more taking off from a standing start with a smaller rear sprocket.

post #3 of 14 (permalink) Old 01-01-2007, 07:20 AM
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I'm running a 38t rear sprocket, love it! As DynoBobSlick said, it's primary benefit is lower engine rpm's at highway speed. The engine is not nearly so busy-sounding. You do lose some off-the-line power, but it's acceptable.

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post #4 of 14 (permalink) Old 01-01-2007, 10:32 AM
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I went with a 39T on mine. It did make a difference but I wish I had gone with a 38t instead....Mike

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post #5 of 14 (permalink) Old 01-01-2007, 10:39 AM
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Every place I've checked is out of stock with the 37t and 38t sprocket. That's why in another thread I'm looking for advice on a 36t.

BTW, I'm doing a 10,000 mile trip this year too... where you heading?


'01 Shadow Ace 750
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post #6 of 14 (permalink) Old 01-01-2007, 11:50 AM
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Quote:
Originally Posted by AverageJoe
Every place I've checked is out of stock with the 37t and 38t sprocket. That's why in another thread I'm looking for advice on a 36t.

BTW, I'm doing a 10,000 mile trip this year too... where you heading?
AJ,
I have a 37 tooth on my 750ACE and don't have any issues with power loss due to the smaller sprocket. I do a lot of riding with a passenger and luggage.

I'd probably go with the 36T if I couldn't find a 37T.
IMO, a 39T isn't worth the trouble of swapping sprockets.....might as well stick with the stocker.
Phil


1998 VT-750 ACE Deluxe

Sterling Heights, Michigan



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post #7 of 14 (permalink) Old 01-01-2007, 11:57 AM
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I've been running a 36 for almost 6 months now. About 4K miles. I have a 2000 ACE with pipes, Bean box mod, 4 degree timing mod and Barnett clutch springs. I only ride solo and can say with my bike's improved performance the 36t is the best choise for me. I commute 40 miles 1 way on 2 lane back roads as well as numerous 200+ milers on weekends. I can cruise easily at 70-80 with adequate passing power and when in town I'm never beyond 3d gear. In fact if I'm cruising around 55-65 and need to get going I can drop to fourth as I can accelerate through 80 easily in fourth. And the best news is they're always " in stock".
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post #8 of 14 (permalink) Old 01-01-2007, 05:09 PM
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I dropped from a 42 to a 39 on my 2002 750 spirit, and ride mostly 2-up.

I really like the drop in rpm at my typical cruise of 70-80, and any loss in acceleration, or pulling away from a stop hasn't bothered me enough to prevent me from considering even a further drop to a 36 tooth.

I used to look for a "6th gear", but now sometimes find myself feeling the shifter and being pleased to find there is one more left.

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then added: Digital tach
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post #9 of 14 (permalink) Old 01-01-2007, 05:49 PM
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I also dropped to a 39 rear ( from a 41) and find it ideal.
I do a fair amount of 2 up riding, and feel that the loss of any torque at the low end is negligble.
The bike no longer feels like it needs another gear, and I can cruise comfortably at 75 to 85 with no problem.

It is probablyone of the best 'mods' I have done, (along with the Mustang seat).

Enjoy the trip.

Harry.

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post #10 of 14 (permalink) Old 01-01-2007, 08:45 PM Thread Starter
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39-Tooth Sprocket

Thanks, everyone, for the replies. Based on that, I'm going to look for a 36 or 37 rather than a 39. I ride alone, and only weigh 145, and low end acceleration that isn't important to me. Thanks again.


I've been off bikes for 20 years, and finally back on the road with a lovely '03 Shadow 750 ACE Planning a major road trip through the U.S. next Spring. Interested in tips re bike camping in Western U.S.
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