chains and sprockets - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 30 (permalink) Old 01-26-2009, 10:44 PM Thread Starter
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chains and sprockets

I just recently purchased a 02 with 9k mi and am looking at changing the chain and sprockets. I am a little confused with the kits which say 520 / 530...etc. what would be a good street combo?
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post #2 of 30 (permalink) Old 01-27-2009, 03:16 PM
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For the street, I'd stay with the 530.
The 530 is the same pitch as the 520 or 525, but is wider and spreads the force across a wider sprocket area.
Now for racing, sure, go with a 520 or 525 as the chain is lighter in weight.
I measured the 530 chain for my bike and it weighed around 4 Lbs.

The stock final ratio is way high for in-town use.
For the street, a very good all around final ratio is 15F/41R.
I have it on mine and it works great, both in-town and highway.
It makes the speedometer about 7 MPH optimistic, but that can be fixed with a Speedo-Healer unit.
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post #3 of 30 (permalink) Old 01-28-2009, 01:13 PM
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DID 520 EVR3 chain....go look at the 520 vs 525 vs 530 specs on the D.I.D. site and you'll see the 520 ERV3 chain is all you need.

My 520ERV has been on my bike for about 10,000mi and I've had zero problems with it.
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post #4 of 30 (permalink) Old 01-28-2009, 03:07 PM
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I just switched from a stock setup to a 520 gold rk x-ring with afram sprockets 15/42 and boy does she move now.
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post #5 of 30 (permalink) Old 01-28-2009, 07:45 PM Thread Starter
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Thanks prob gonna go with the did 525.
post #6 of 30 (permalink) Old 02-17-2009, 12:59 AM
 
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Originally Posted by jgos929 View Post
I just switched from a stock setup to a 520 gold rk x-ring with afram sprockets 15/42 and boy does she move now.
How high are the rpm's on the highway?, say at 70mph with that 42T sprocket!
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post #7 of 30 (permalink) Old 02-17-2009, 03:17 PM
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I have 15/41 final gearing and a 190/55-17 Pirelli Corsa III rear tire.
According to my gearing calculator and measured circumference of my tires, my speed at 4000 RPM is 67 MPH. At 5000 RPM it's 84 MPH.

Now for a 15/42 combo with a 190/55 tire, I calculate 66 MPH at 4000 and 82 MPH at 5000.
A 190/50 tire will be slightly shorter and the MPH will be slightly less.

So either way, the RC51 will be lazily loping along at those speeds in 6th.
At 70 MPH in 6th, the RC51 is barely in the torque range and not even in the HP band.That's not until 100 MPH and 6000 RPM.

Need to make pass on the freeway? Drop it down to 5th and run it up to 120 MPH (8000 RPM), hit 6th and keep on rockin' up to 155+.
All the while hearing those pipes booming. I love it.
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post #8 of 30 (permalink) Old 02-17-2009, 04:23 PM
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Quote:
Originally Posted by Hydroboy35th View Post
How high are the rpm's on the highway?, say at 70mph with that 42T sprocket!
Well at 70mph(85 on speedo) its right around 5000rpm + or - some change

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Originally Posted by SubSailor View Post
So either way, the RC51 will be lazily loping along at those speeds in 6th.
At 70 MPH in 6th, the RC51 is barely in the torque range and not even in the HP band.That's not until 100 MPH and 6000 RPM.

Need to make pass on the freeway? Drop it down to 5th and run it up to 120 MPH (8000 RPM), hit 6th and keep on rockin' up to 155+.
All the while hearing those pipes booming. I love it.
You've been saying some weird things lately. First off the 51 is not "lazily loping along" at 70mph in 6th with a 15/42 setup. I don't know if you've ever done the 15/42 cause I've only read that you have 15/41 but you'd be surprised what that one extra tooth will do. Before with stock gearing I would have to downshift into 5th sometimes 4th to make a pass. Now I don't I can leave it in 6th with no problems. And 4K rpm and above are this bikes sweet spots. What your failing to mention is that with the gear change your going to reach the higher rpm's quicker. And why in the world would you just run it up to 8K in 5th then make the switch? This bike makes power all the way to redline. Run it up to 10K rpm and then make the switch.
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post #9 of 30 (permalink) Old 02-17-2009, 05:02 PM
 
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Im just orderd 15T/41T,..Im wondering if I should of gone with a 42T????
mostly street riding!
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post #10 of 30 (permalink) Old 02-17-2009, 05:35 PM
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I don't run the 15/42 combo, only the 15/41.
I only calculate 2 MPH difference between the two, so they're relatively close.
So if you're traveling down the freeway at 70 MPH and the tach is registering half or slightly over half rated RPM, I'd say "lazily loping" at 4500-5000 RPM could be a apt description for an RC51.
Instead, how about "happily humming"?

The soft rev limiter cuts in at 9250 and the hard limiter at 10,200.
I've never had a reason to rev it to 10K.
It's the mechanic part of me that doesn't push the hardware to the limits.

Last edited by SubSailor; 02-17-2009 at 05:43 PM.
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