Chain weight question and sprocket percent adjustment
 

Just wondering how much the SHawk chain weighs. I believe it's 102 links. I was considering either buying the EK 530MVXZ or EK 530ZZZ chain (which is better?)

Someone also please correct me what the exact percentage difference from a 15 to 16 tooth front sprocket change is? I believe it's 7% but I need it down to a tenth because I'm getting the SpeedHealer speedo-adjuster.

Also, how off is the SHawk for speed normally versus speedo? I can adjust for that as well, amazingly.

Re: Chain weight question and sprocket percent adjustment
 

Its 6.69 % change, because regardless of what rear sprocket you run, the numerator in the equation will always be 15 versus 16. Just so happens that 16 is 6.69% larger than 15. Not a coincidence, I'm an engineer.

P.S. - When you change out the rear sprocket for a larger one, it adds that percent difference to the mix also, in the same line of thought, if you went smaller in the rear, it would subtract from it. 41 to 43 is about a 4.7% change, for a total of over 11% difference (that's consistent with my bike's uncorrected speedo).

Re: Chain weight question and sprocket percent adjustment
 

Re: Chain weight question and sprocket percent adjustment
 

I'll use my GPS receiver to get a good idea of my actual speed today and see how far off it is at 60mph. Thanks for the 6.69% info!

The link was a good deal but the EK chain ZZZ series is very light and therefore less pull required for the front sprocket and then less torque lost at the rear wheel I think. The RK chain they offer is about the same weight so no benefit, and I don't want to change out my rear sprocket. Just up one in the front only. Thanks for the link though! Wow! You're pretty cool to find that so fast!

Anyone still know the weight of the EK ZZZ chain versus the stock '05 chain?

Re: Chain weight question and sprocket percent adjustment
 

If you did in fact purchase the Speedo Healer, then all you need to know is the stock sprocket configuration (# teeth front & rear), new config, and the percent speedo error with the stock setup. Then you download the handy SH Calculator and input all necessary variables. The program gives you total % speedo error as well as the needed SH calibration value. Then you just click on Generate Instructions and go to work on the bike. Very easy to do, and it works quite well from my personal experience.

Re: Chain weight question and sprocket percent adjustment
 

I like it! It is both delicious and nutritious.

Re: Chain weight question and sprocket percent adjustment
 

Hi,

not sure how the 6.69% change for going to a 15 teeth front sprocket was arrived at but I sense it is incorrect and here is why:

formula should be as follows:
new gearing/old gearing = relative difference (as % or original gearing)

so (15/41) / (16/41) = .9375
This means that the 15/41 combo is only 93.75% as high as the 16/41 combo.

Stated differently, it is 1-.9375 = 0.625 = 6.25% lower

cheers
Mikstr

Re: Chain weight question and sprocket percent adjustment
 

Yeah, I meant to say to go to 15T from the stock 16T. This will give me 6.67% acceleration and I'll have to lower the speedo the same amount as it'll be off. I'll also lose the same in gas milage unless I shift earlier (which is plausable due to the lower torque range) but I normally shift around 4k rpms anyway and get 45mpg +/- 2mpg depending on different things so 2-3mpg won't be a big deal. I normally fill-up at 140 miles on the odometer (that's when the fuel-low starts blinking) which is (I believe) 3.7 gallons. It'll probably be more like 130 now.

Mike

Re: Chain weight question and sprocket percent adjustment
 

sory Mike, but he 6.67% would apply if you were going from a 15 to 14. Going from a 16 to a 15 will result in a 6.25% difference. I realize we are talking relatively insignificant differences but they are there nonetheless. If in doubt, try the math yourself and you will see.

cheers
Mikstr

Re: Chain weight question and sprocket percent adjustment
 

one other thing, of you were going from a 15 to a 16, you would be going UP by 6.67%. In your case, you are moving away from a base setting of 16 teeth so it must be used as your baseline.

Isn't 6.69% US equal to 6.67% Canadian?

Re: Chain weight question and sprocket percent adjustment
 

I added the SpeedoHealer and set the unit to -6.7% change. I'm not sure how far off the speedometer is from factory but I'm accounting for a 0.5% over-read amount at least (-6.2 + -0.5 = -6.7). Rumor has it that the speedometer from factory is off by 5% or so too fast but I'll try with the -6.7% total and see where we go via GPS (after a long time).

Mike

Re: Chain weight question and sprocket percent adjustment
 

If you have a GPS just check actual speed and speedo reading then go to speedohealers calculator type in actual speed and speedo reading and that will give you the % difference.

No math involved

Re: Chain weight question and sprocket percent adjustment
 

Ended up tooling around with the receiver at 3 minute samplings of sustained speed and got it to -14.0 percent change. Interestingly the sprocket was -6.7 percent off so the factory set was at -7.3 percent off!!! It was reading seven point three percent too high!!! That means at 100 mph I was really only going 93.7 mph or so!!! Crap! :cry:
Since top speed on the SH is probably around 150 mph, it'd be off by 10 mph and might read 160 mph! I can't believe all these sportbikes are shipped out with 0-10 percent speedo error! I've read about it but actually observing it makes me a little ticked off.
Anyway, the SpeedoHealer works like a charm and took about 8 seconds to install and 1 minute to program (to include seat removal). Pretty cool deal so you know if you're speeding for REAL or not!

See that's exactly what I told that cop:

I said, "Yeah, you have me clocked at 91mph but my sprockets have been modded, so I was really only going like 72mph."

(He said, "Doesn't matter skinny boy, it's a school zone, now turn the bike off and get on the ground...")

But it's good to know the exact percentages. ;)

Re: Chain weight question and sprocket percent adjustment
 

Thank you one and all.
Now I know why moped riders keep beeping when they pass me at 55mph.

I'd better check my speedo.
:o