Topic: Best sprocket ratio to achieve a good motorway cruising speed

[Kenny]

Planning  some trips next year and will be using motorways and concerned about high RPM and read a few inputs on different sprocket ratios so any suggestions on front and rear sizes and what RPM at 70 MPH.

[FunJimmy]

Recommendations will depend on the bike.

[stikman]

What rear tire size are you going with?

[Kenny]

Hi thanks for the response its 1978 on a 17 in tyre engine in fit condition.

[70CB750]

No sure if this worls for Automatic too, but here is a gear ration calculator.

[nixon]

changed to 17 /43 and it sits on 55mph much nicer than the 15 41 i think was stock

1 tooth up front is worth 3 in rear my understanding

SunStar 530 Conversion RDG O-Ring Chain/Sprocket Kit 17-43

[BobbyR]

I would recommend the stock gearing. You need to determine if you in fact have the stock gearing. It is rare that we are the original owners. The PO may have fiddled with the gearing.

Honda understood the torque curve of the motor and geared accordingly.  What seems high reving to us but it is not since we are accustomed to the overdrives in our cars.

My K8 runs at about 5K at 70mph which has me in lower end of the power band which starts at about 4K.  If you set the ratios to slow down the motor, you will lose your passing power and your engine braking. Your bike will feel sluggish on the local roads.

These motors love to rev and will run all day at 5k.

[nixon]

I would recommend the stock gearing. You need to determine if you in fact have the stock gearing. It is rare that we are the original owners. The PO may have fiddled with the gearing.

Honda understood the torque curve of the motor and geared accordingly.  What seems high reving to us but it is not since we are accustomed to the overdrives in our cars.

My K8 runs at about 5K at 70mph which has me in lower end of the power band which starts at about 4K.  If you set the ratios to slow down the motor, you will lose your passing power and your engine braking. Your bike will feel sluggish on the local roads.

These motors love to rev and will run all day at 5k.

hes refereing to the "A" not the K or F bikes..2 speed