Topic: rpm at 120 mph (Read 9753 times)

laylonlor · « **on:** June 16, 2012, 04:26:59 PM »

2010 cvo streetglide stock gearing what is the rpm at 120 mph?

Cvostu · « **Reply #1 on:** June 16, 2012, 04:32:53 PM »

Bet lots of us can answer that one.

Midnight Rider · « **Reply #2 on:** June 16, 2012, 04:47:12 PM »

If I get to 120mph, I'm not looking at my tach...

But here's a calculator to figure it out if you want to: http://www.bgsoflex.com/rpmmph.html

mjb765 · « **Reply #3 on:** June 16, 2012, 04:48:49 PM »

Quote from: Midnight Rider on June 16, 2012, 04:47:12 PM

If I get to 120mph, I'm not looking at my tach..

But here's a calculator to figure it out if you want to: http://www.bgsoflex.com/rpmmph.html

X2..not really worried about RPM at that point.

110tHunDer · « **Reply #4 on:** June 16, 2012, 04:57:11 PM »

Why don't you go find out and report back.

cvobiker · « **Reply #5 on:** June 16, 2012, 05:04:50 PM »

dont know but i take a guess 4,900rpm

Cvostu · « **Reply #6 on:** June 16, 2012, 05:06:29 PM »

Does it really matter.

grc · « **Reply #7 on:** June 16, 2012, 05:42:38 PM »

Quote from: Midnight Rider on June 16, 2012, 04:47:12 PM

If I get to 120mph, I'm not looking at my tach...

But here's a calculator to figure it out if you want to: http://www.bgsoflex.com/rpmmph.html

Looks like that calculator is designed for automotive type vehicles, not Harley's. No place to input the primary drive ratio.

The final drive (belt) ratio on a 2010 SESG is 2.125 (68/32), the trans ratio in 6th is 1.0, the rear tire diameter is 26.18". If you just plug those numbers into the calculator you come up with 3274 rpm at 120 mph. Definitely not a good number. To make the calculator work correctly for a Harley, you need to multiply the final drive (belt) ratio by the primary drive ratio to come up with what the calculator calls the final gear ratio. So instead of putting in 2.125 in that first box, use 2.875 instead. Now the rpm at 120 mph comes out at a more realistic 4430 rpm.

Primary = 46/34 or 1.353 Final Drive = 68/32 or 2.125 Total overall ratio = 1.353 x 2.125 = 2.875 in 6th gear

btw, Overall ratios for late model Touring bikes with 68 tooth rear sprockets:

1st = 9.593
2nd = 6.650
3rd = 4.938
4th = 4.000
5th = 3.407
6th = 2.875

Jerry

D-N-D · « **Reply #8 on:** June 16, 2012, 06:35:51 PM »

120 MPH

grayghost731 · « **Reply #9 on:** June 16, 2012, 07:29:12 PM »

I also am not lookin at my tach

If and when I even do go over a hundred (on a HARLEY)

crotchrocket all day long over a hundred for miles and miles

HogBreath · « **Reply #10 on:** June 16, 2012, 08:37:01 PM »

5th or 6th gear?

FUNGOUL · « **Reply #11 on:** June 16, 2012, 08:55:32 PM »

dam it forgot to get the tach

willymax4 · « **Reply #12 on:** June 16, 2012, 10:14:04 PM »

Quote from: FUNGOUL on June 16, 2012, 08:55:32 PM

dam it forgot to get the tach

and so soon after the 1k breakin period. there's a man after my own heart.

EZRIDN · « **Reply #13 on:** June 16, 2012, 10:43:35 PM »

Why only 120mph?

laylonlor · « **Reply #14 on:** June 16, 2012, 11:27:43 PM »

i always forget to look at the tach, i was thinking around 5 grand

SBB · « **Reply #15 on:** June 17, 2012, 01:04:28 AM »

Quote from: 110tHunDer on June 16, 2012, 04:57:11 PM

Why don't you go find out and report back.

This is a typical ride with JCZ.
Following JC is always a fun ride.
Not 120 but it did stay on a 100 for many many miles.

SBB

North Georgia Hawg · « **Reply #16 on:** June 17, 2012, 01:50:08 AM »

When I'm going 120, I'm usually looking at my iPad mounted on the left handlebar, so I can make sure I get those 80 kPa, 4000+ RPM cells all filled in GREEN on the DataMaster histogram!!!

Or at the radio to get the iPod to play "Highway To Hell"...

SilveRT8 · « **Reply #17 on:** June 17, 2012, 03:06:24 AM »

Double your 60 mph / rpm

Cvostu · « **Reply #18 on:** June 17, 2012, 08:14:32 AM »

That's sounds like the best idea of em all. And maybe you won't kill yourself along the way.

110tHunDer · « **Reply #19 on:** June 17, 2012, 08:45:17 AM »

Who rides 60, either, though.

Cvostu · « **Reply #20 on:** June 17, 2012, 08:50:42 AM »

Then you can take it back to 90 after you do the math.

cvobiker · « **Reply #21 on:** June 17, 2012, 10:18:11 AM »

Quote from: SBB on June 17, 2012, 01:04:28 AM

This is a typical ride with JCZ.
Following JC is always a fun ride.
Not 120 but it did stay on a 100 for many many miles.

SBB

And JC is trying to fight a speeding ticket?

FUNGOUL · « **Reply #22 on:** June 17, 2012, 02:38:35 PM »

4200 rpm at 120 today on the sawgrass sixth gear

grc · « **Reply #23 on:** June 17, 2012, 02:48:39 PM »

Quote from: FUNGOUL on June 17, 2012, 02:38:35 PM

4200 rpm at 120 today on the sawgrass sixth gear

Must have an inaccurate speedo or tach, since 4200 rpm should equal 114 mph according to the calculator. I think you should file a complaint with H-D.

Jerry

FUNGOUL · « **Reply #24 on:** June 17, 2012, 02:55:41 PM »

ok i'll post a pic soon but all i was looking at was the tach this time just for this reason
i think the calculator is wrong 4200 maybe 4300 at 120 mph 6th gear

FUNGOUL · « **Reply #25 on:** June 17, 2012, 03:00:08 PM »

Quote from: willymax4 on June 16, 2012, 10:14:04 PM

and so soon after the 1k breakin period. there's a man after my own heart.

break in what's that

110tHunDer · « **Reply #26 on:** June 17, 2012, 03:15:09 PM »

Quote from: grc on June 17, 2012, 02:48:39 PM

Must have an inaccurate speedo or tach, since 4200 rpm should equal 114 mph according to the calculator. I think you should file a complaint with H-D.

Jerry

My speedo is off by 4 mph versus the GPS at 110 mph, so a 6 mph error at an even higher indicated speed doesn't seem outside the realm of possibility.

grc · « **Reply #27 on:** June 17, 2012, 05:00:57 PM »

Quote from: FUNGOUL on June 17, 2012, 02:55:41 PM

ok i'll post a pic soon but all i was looking at was the tach this time just for this reason
i think the calculator is wrong 4200 maybe 4300 at 120 mph 6th gear

Trust me, I did my own calculations as well as plugging the info into that calculator Terry posted a link to. 4200 rpm with stock gearing and tire is 114 mph, just like that calculator says. Harley speedometer's are pretty optimistic when you get into the triple digit area.

Jerry

Midnight Rider · « **Reply #28 on:** June 17, 2012, 05:11:58 PM »

HD speedometers are "happy", as are a lot of auto speedometers. Mine read 3 mph faster than I was going at "normal" speeds (60-80mph), and may have been worse at triple digit speeds, I don't know. I calibrated mine to within .5 mph (close enough for government work) with the TTS. If in doubt, look at the GPS speed...it's accurate if it's picking up more than two satellites.

My bike has seen 120mph, but only for a very brief period of time...things happen very quickly at 120mph so my eyes are pointed directly in front of me.

laylonlor · « **Reply #29 on:** June 17, 2012, 07:31:37 PM »

checked mine again it was 4200 rpm at 120

PASN YU · « **Reply #30 on:** June 18, 2012, 07:28:08 AM »

I can't believe you guys are riding a Harley at 120mph...

Dead_Reckoning · « **Reply #31 on:** June 18, 2012, 10:00:19 AM »

Quote from: FUNGOUL on June 17, 2012, 07:36:17 PM

http://s1066.photobucket.com/albums/u406/FUNGOUL/

TACH VIDEO SOON

Was that the Radio On in the background?

FUNGOUL · « **Reply #32 on:** June 18, 2012, 10:43:15 AM »

North Georgia Hawg · « **Reply #33 on:** June 18, 2012, 11:23:41 AM »

Quote from: PASN YU on June 18, 2012, 07:28:08 AM

I can't believe you guys are riding a Harley at 120mph...

Where's your sense of ADVENTURE, Jeremey???

smkymtnboy · « **Reply #34 on:** June 18, 2012, 09:31:35 PM »

mine was 4000 rpm @110 3600@100. had to exit before 120 will report back.not sure if loaded single or double would change rpms?

110tHunDer · « **Reply #35 on:** June 30, 2012, 06:39:35 PM »

Looks like 4500 to me.

Do it again, just to be sure.

Twolanerider · « **Reply #36 on:** June 30, 2012, 07:08:42 PM »

Quote from: 110tHunDer on June 30, 2012, 06:39:35 PM

Do it again, just to be sure.

Definitely. MTBF for that effort has to be at least a half dozen times. So good to go for several more!

grc · « **Reply #37 on:** June 30, 2012, 07:27:52 PM »

Yeah, do it a few more times, and try to take the picture at 90° to the face of the gauge next time to eliminate any parallax error. btw, I'm adding a disclaimer just like all those big companies do these days. "The choice to follow my recommendation is strictly the responsibility of the rider. Any tickets or other negative outcomes are not my fault, and I will not be accountable for such negative outcomes."

Jerry

smkymtnboy · « **Reply #38 on:** June 30, 2012, 10:50:21 PM »

Quote from: FUNGOUL on June 30, 2012, 06:21:33 PM

4200
[/quote mine reads about the same 4300-4400 rpm. i cant let go to take the picture,all those feathers on my legs keep blowing off just chicken i guess!

smkymtnboy · « **Reply #39 on:** June 30, 2012, 10:52:33 PM »

Quote from: HogBreath on June 16, 2012, 08:37:01 PM

5th or 6th gear?

5th will not do 120. not mine anyway

grc · « **Reply #40 on:** July 01, 2012, 10:52:44 AM »

Quote from: smkymtnboy on June 30, 2012, 10:52:33 PM

5th will not do 120. not mine anyway

Unless you changed the final drive ratio, 120 should be about 5200 rpm in 5th gear. Are you saying your bike won't pull 5200 rpm in 5th, or are you one of the guys who did the 30 tooth trans sprocket?

Jerry

ChiTracker · « **Reply #41 on:** July 01, 2012, 11:24:05 AM »

I just did this last weekend. Had to race a loud mouth friend with a 103. My 12 flhxse3 was at 4600 rpm at a bit over 120 in 6 th. I think the bike only has the ability to pull about 125 MPH in 6 th

Cvostu · « **Reply #42 on:** July 01, 2012, 01:08:53 PM »

Youz guys are a whole lot braver than I could ever be. I think my limit is about 100. Maybe I just like my head a little more than some.

Or maybe I'm just not in that big of a hurry.

dayne66 · « **Reply #43 on:** July 01, 2012, 01:16:39 PM »

I've already lost my Jeep for a week for 159 km/h.....don't wanna lose Ruby!...but do like the pics!!

CVOJOE · « **Reply #44 on:** July 01, 2012, 02:30:32 PM »

Remember to check your tire speed rating when you get her stopped. H rated tire is only good for 130MPH as I recall.

grayghost731 · « **Reply #45 on:** July 01, 2012, 02:56:57 PM »

Quote from: ChiTracker on July 01, 2012, 11:24:05 AM

I just did this last weekend. Had to race a loud mouth friend with a 103. My 12 flhxse3 was at 4600 rpm at a bit over 120 in 6 th. I think the bike only has the ability to pull about 125 MPH in 6 th

How bad did he beat you LOL

Eagle Eye · « **Reply #46 on:** July 01, 2012, 03:00:17 PM »

X2 keeping up with JCZ and Terri on I-5. Yessseerrreeee!

110tHunDer · « **Reply #47 on:** July 01, 2012, 03:40:24 PM »

Quote from: FUNGOUL on July 01, 2012, 10:37:15 AM

http://s1066.photobucket.com/albums/u406/FUNGOUL/

Nice. But you haven't done 120 yet. There's this thing called speedo error.

smkymtnboy · « **Reply #48 on:** July 01, 2012, 06:16:20 PM »

Quote from: grc on July 01, 2012, 10:52:44 AM

Unless you changed the final drive ratio, 120 should be about 5200 rpm in 5th gear. Are you saying your bike won't pull 5200 rpm in 5th, or are you one of the guys who did the 30 tooth trans sprocket?

Jerry

saying it probably won,t stay together.

Twolanerider · « **Reply #49 on:** July 01, 2012, 09:03:27 PM »

Quote from: 110tHunDer on July 01, 2012, 03:40:24 PM

Nice. But you haven't done 120 yet. There's this thing called speedo error.

Unfortunately true. They are fast by just a bit. So whatever you just touched on the speedo wasn't actually quite reached yet. No appreciable difference in the pucker factor though. Still get points for that.

miker · « **Reply #50 on:** July 02, 2012, 11:08:51 AM »

Quote from: PASN YU on June 18, 2012, 07:28:08 AM

I can't believe you guys are riding a Harley at 120mph...

The only way to get across the sawgrass...mine tub only made about 105...hp to weight ratio thing..

KennyC · « **Reply #51 on:** July 10, 2012, 12:38:46 AM »

Quote from: grayghost731 on June 16, 2012, 07:29:12 PM

I also am not lookin at my tach If and when I even do go over a hundred (on a HARLEY)

crotchrocket all day long over a hundred for miles and miles

Rode my son-in-laws R-1 to 131 and had to make an exit. Then got on my

for some more! At 112 or so on a very windy day I started getting a little wobble on the handlebars!!

The Pumkin got there quick and felt like she had some more to give! Don't remember the RPM's but seems like I had plenty to spare! That wiggle was my cue to ease out.

After a shock upgrade I may try it again??

laylonlor · « **Reply #52 on:** July 10, 2012, 11:32:13 AM »

my 110 cvo sg has been smooth with no wobble at 120 so far

KennyC · « **Reply #53 on:** July 10, 2012, 05:44:25 PM »

Quote from: laylonlor on July 10, 2012, 11:32:13 AM

my 110 cvo sg has been smooth with no wobble at 120 so far

That's good! I've heard a few guys on the forum talk about some bad wobbles on some new models at even 100 MPH. One guy said he went down?? Not Good!! I think the wind contributed to mine that day. It wasn't like a tank slapper bout to happed just more wiggle in the handle bars than I felt comfortable with!

Author Topic: rpm at 120 mph (Read 9753 times)