RPM to MPH Chart(s)

steveyacht

Joined

Aug 11, 2009

Messages

294

• Aug 14, 2011

• #1

Anyone know of a comparison chart available that compare different primary sprocket sizes to RPM's at given MPH? I am interested in seeing approximately how many rev's I am saving at 70 MPH cruising speeds with a 20 or 21 tooth primary vs my original 19.

 

L.A.B.

Moderator

VIP MEMBER

Joined

Nov 20, 2004

Messages

20,119

• Aug 14, 2011

• #2

Workshop manual?: http://www.classicbike.biz/Norton/Repai ... mmando.pdf (pdf p.25)

 

A

AussieCombat

Joined

Jan 20, 2011

Messages

893

• Aug 14, 2011

• #3

Hey Steve try this,.....
Norton Owners Club of NSW. here in Aus.
www.nocnsw.com.au
AC.

 

P

pdl999

Joined

Nov 11, 2010

Messages

103

• Aug 15, 2011

• #4

I have a simple Excel spreadsheet you can try if you PM (I'd attach it but I can't see how you do that here, but perhaps it isn't allowed in case of virus?). You just need to enter the data applicable to your particular bike and then you can see the MPH for any RPM with that set up.

 

A

AussieCombat

Joined

Jan 20, 2011

Messages

893

• Aug 15, 2011

• #5

19 th...4,500 = 69.43 mph. (4.84:1) = 15.429 mph per 1,000 revs.
20 th...4,500 = 73.29 mph. (4.60:1) = 16.286 mph per 1,000 revs.
21 th...4,500 = 76.50 mph. (4.38:1) = 17.000 mph per 1,000 revs.
22 th...4,000 = 70.64 mph.
AC.