MPH to RPM correlation

[cyclejohn]

Hey All,

I wonder if I could get a favor from someone running OEM wheels and stock tire sizes?

The next time you go out for a ride, would you take note of the RPMs at 60mph (indicated), and also at 70mph, and post them up for me?

Just curious about this since I don't have OEM wheels or stock tire sizes mounted up.

Thanks,
John

 

[jfeagins]

If memory serves...........60mph is right at 4k rpms, while 80 would be really close to 5k rpms.....since you are asking for ballpark #'s. Not sure about 70mph.

 

[Traumahawk]

For me with the stock wheel, 75 mph was 4800, I cant remember what the others were.

 

[D-Max2012]

I wanted to know this also.
I was also curious as to how my new Shinko 230 Tourmaster 120/90-18 reacts on the tach's reading vs GPS speed, and Engine RPM at that speed.

I'll post up after next ride..

 

[blaxmax]

120/90/18 front 170/80/15 rear---50mph=3200rpm 60mph=4000rpm
70mph=4400rpm
75mph=4800rpm
80mph=5000rpm

 

[MaxMidnight]

I think this is what you need?

 

[Traumahawk]

I think this is what you need?

Thanks Steve. I added that to my Vmax file.

 

[Specs95t]

I have the Shinko 120 up front and saw 2-3 mph faster on the speedo compared to the gps.


Sent from my iPhone using Tapatalk

 

[cyclejohn]

Thanks everyone for the replies.

I had a chance today to take the bike out and write down the #'s.

MPH indicated / RPMs
50 / 3000
60 / 3650
70 / 4150
80 / 5000

These #'s are with 17" Dymag wheels with a 120/70-17 and 180/55-17 mounted on them.

In the last couple of weeks I have been on a couple of short rides with 2 different friends (1 on a Yamaha Tenere and 1 on a VTX1800) and I would put them in the lead. When they reached 60MPH indicated on their speedo they would hold their hand up so I could check my speedo readout. Both times I was traveling 60 indicated when they were.

This bike (2006) just feels different than my last Vmax (2003 that burned up in a fire last year) which I owned for 12 yrs.

Doing 60MPH on this bike with these wheels feels like I'm going about 40. 80MPH feels closer to 55.

When I mounted the 17" Dymags I also installed a speedo drive gear from a YZF600R that was suggested to me on the forum here from another thread. So, I guess it looks like that drive unit puts the speedo exactly where it needs to be for a 17" wheel.

Thanks again everyone,
John