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Buell Forum » Old School Buell » Archive through April 04, 2016 » Reducing the Final Drive Ratio for an S3T « Previous Next »

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Buelldualsport
Posted on Sunday, March 06, 2016 - 08:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Friend has reached out for a method to drop the RPMs in 5th gear while cruising the Interstate

a 29 tooth front pulley will still work with the stock 128 tooth belt.

The change to a 29 will drop the final drive ration by app 7%

A 32 Tooth sportster overdrive pulley will reduce the final drive ration by app 15%.

The question is what belt would need to be used for that combination. A 130 tooth Sportster belt?

Input and experiences will be apprciated

(Message edited by Buelldualsport on March 06, 2016)
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Lornce
Posted on Sunday, March 06, 2016 - 11:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

32T/61T combination will result in 1.91 reduction.

29T/55T gives a similar ratio at 1.90 and allows use of the stock belt. Another option to consider if you can find a 55T rear pulley, which were stock on many Euro model Tube Frame Buells.

Ran 29T/55T pullies on a T-Stormed S2 and for my taste it was well suited for street and high speed expressway running.
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Pontlee77
Posted on Monday, March 07, 2016 - 03:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If i lived in US i'd trade my 29-55 for the 27-61, pitty shipping parts from Spain is so expensive.
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Buelldualsport
Posted on Monday, March 07, 2016 - 07:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thank you all

The 55 T is almost as elusive as the Unicorn here in the Colonies.

Working with Basti on getting one from Germany

Appreciate the input
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Damnut
Posted on Monday, March 07, 2016 - 09:32 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I already have a 29 tooth front and would love a 55 tooth rear since I use my S3T almost exclusively for long rides.

Anyone want to trade?
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Phelan
Posted on Monday, March 07, 2016 - 09:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I don't understand why people always want to drop RPM on the highway. Usually it's because they put a louder exhaust on the bike and they want to avoid the drone. But under 3000 RPM oiling and power is quite poor. It makes more sense to keep the RPMs above 3000 on the highway, so there's actually less load on the bike since it's making more power and torque. And they are built to last there.
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Natexlh1000
Posted on Monday, March 07, 2016 - 10:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sometimes "highway" means sustained 85-100 MPG for some people.
Ever ride route 40 through north Texas and Oklahoma?
Sometimes reality needs a fast forward button.
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Phelan
Posted on Monday, March 07, 2016 - 10:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It's much like I25 from Collins to Denver. I'm from Amarillo and before that Weatgerford, OK, so I know all about I40 travelling. Even still 4000-4500 RPM is no big deal, and the same argument against implies.
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Lornce
Posted on Monday, March 07, 2016 - 10:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So why did Buell opt for the 29/55T combo on Euro market bikes where higher speeds are often possible?
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Natexlh1000
Posted on Monday, March 07, 2016 - 11:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

They did that in Europe due to more stringent noise tests I think.
They had a smaller exhaust pipe diameter too as I recall.
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Damnut
Posted on Monday, March 07, 2016 - 12:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

For me it's lowering the rpms a little more and getting better gas mileage. I have 150 mile roundtrip to work, mostly highway, and usually ride at or above 80 so knocking a few rpms off and getting better mileage is a plus.
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Lornce
Posted on Monday, March 07, 2016 - 01:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The 29/55T combination worked well for me. Plenty of torque to handle the lower gears in all riding situations and a nice 5th gear option for high speed highway running.

4k rpm = 100mph.
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Damnut
Posted on Monday, March 07, 2016 - 01:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Anyone have a 55 tooth rear pulley?
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Buelldualsport
Posted on Monday, March 07, 2016 - 01:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Nut

I have been searching for 6 months

If you find 2 let me know.

Regards
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Xldevil
Posted on Monday, March 07, 2016 - 01:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Almost anyone in Germany changed the final drive
to 27/61.
The German combo 29/55 was only used to pass the noise test,like mentioned before.
Together with the street legal exhaust and that Helmholtz Unicorn,the bike slows down when shifting in 5th gear.
For me,although having the autobahn,it makes no sense to ride the German ratio.The 5th gear becomes useless.
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Lakes
Posted on Monday, March 07, 2016 - 07:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the 29\55 was used in Australia too & most went to 27\61, i would like 26\61 myself ( easier on bottom end roller bearings
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Pontlee77
Posted on Monday, March 07, 2016 - 08:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have a 29-55 that i'd like to trade, i'll check the price of postage from Spain to the US, and see if we can arrange an exchange
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Buelldualsport
Posted on Tuesday, March 08, 2016 - 06:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Pontlee

Thank you for the offer

Basti is working on getting us one he has in DE.

Appreciate the offer.

Regards
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Lakes
Posted on Tuesday, March 08, 2016 - 03:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My friend rented a 6 speed sport Glide HD fount the 6th gear to drop the rev's a lot. but also found the bike to have a higher top speed in 5th than in 6th. it could not pull the tall gears
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Pontlee77
Posted on Monday, March 21, 2016 - 08:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Another option is using an Xb12 primary sprocket it will compensate the 27-61 vs 29-55 or close to it should make the gears around 10% Longer.
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