Top speed with ceramic bearings? - ZX6R Forum
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post #1 of 22 Old 07-29-2016, 12:50 PM Thread Starter
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Top speed with ceramic bearings?

Ok so I bought the bike 4-5 months ago as you all know, it didn't have a lot of mods. But the guy did say that it had a wheel bearing fail shortly before he decided to sell it and he got a kit of new ceramic bearings for a steal so he got them. Anyways, I never knew that wheel bearings could increases a "top speed" I know less rotational mass , less friction, etc but I just assumed it meant the wheel would spin more free and get up to top speed quicker (kind of like re gearing the bike) but when I was detailing my bike I had the wheel off and noticed the wheel bearings said "WWB" so I happened to look into them, apparently about $400 + shipping and is 60% lighter with less friction and higher top speed?
I always thought my 173 top speed was exaggerated b/c I heard of people on here, YouTube, etc getting their top speed to 164-170 and it was really only 155 or so. So I just assumed at 173 I was really only at 160 max which for a stock 600 seems about correct. But I was telling my friend my speedo was saying 173 at 16k rpm / 6th gear. And he was like "there's no way" "you need a speedo healer" he said here use my gps and get your real speed. I didn't have the chance to get all the way up to top speed but when the gps said 120 my speedo said 120. So it seems my speedo was reading accurately. I still have the guys number I bought it from and called him to ask if he had the speedo corrected and he said "yes when I first got the bike I was tired of the reading being inaccurate even at Lower speeds so I had the speedo corrected back in 2014"

So my question is, 173mph top speed on a 600cc with upgraded exhaust, air filter, wheel bearings (as my only "performance" mods) possible? That's nearly 15mph give or take higher top speed from stock, just from wheel bearings? I've never been on a completely bone stock 09-12 zx6r so I can't speak on the difference between stock bearings vs these. It just seemed a little inflated but the gps and speedo seemed to be matching all the way up to 120. What do y'all think?
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post #2 of 22 Old 07-29-2016, 01:25 PM
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Since the track I run at has about a half mile straight doubt I'll ever find out.
Made it to 140 or so that's about it.

Is it possible, sure just about anything is possible.
Put a nice small rider half my size, long enough straight, no wind have my doubts.

Then I remembered a web site Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator

You load your bike and they do the math for top speed in any gear with stock gearing and allow you to change sprocket sizes to see what you gain.

There site shows a new Ninja 2015 tops out at 155.6
That does NOT take into account any factors like drag etc just gearing and red line.
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post #3 of 22 Old 07-29-2016, 02:05 PM
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Less rotational mass isn't going to affect top speed. It will affect how fast you get there, but considering the weight of the bearing and its parts and its location (low inertial moment since its all near the center of rotation), the difference will likely be very minor. Lower friction may help with top speed, but if you can top out your gearing with OE bearings, then lower friction bearings won't do a damned thing. If you're geared such that you can actually hit an aero limited speed, then possibly.

My 2015 hits about 80-85 indicated at 8000 RPM. At 16K redline, it should be double. This does not account for any errors in the speedo. 160 to 170 seems reasonable depending on how much error there is. Of course actual ground speed may be a little different if aero drag is significant. There could be some tire slip occurring up at high speed that could cause a difference between indicated and actual, in addition to the speedo error. But in such a case, gearing limited top speed would result in lower top speed than the calculated top speed.
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post #4 of 22 Old 07-29-2016, 02:07 PM Thread Starter
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Originally Posted by Indy View Post
Since the track I run at has about a half mile straight doubt I'll ever find out.
Made it to 140 or so that's about it.

Is it possible, sure just about anything is possible.
Put a nice small rider half my size, long enough straight, no wind have my doubts.

Then I remembered a web site Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator

You load your bike and they do the math for top speed in any gear with stock gearing and allow you to change sprocket sizes to see what you gain.

There site shows a new Ninja 2015 tops out at 155.6
That does NOT take into account any factors like drag etc just gearing and red line.

Yeah man, my friend was like "idk maybe with your scrawny ass on it, it does" I weigh about 138-142lb it varies. 6 foot tall. Ceramic bearings. So yeah I had no doubt after I saw the gps and speedo say the same speed all the way to 120. I have no doubt in my mind that with my light self on there, there was no wind that night, So I feel I did truly hit 173 and that was the very top of 16k rpm in 6th gear. I just wasn't sure if JUST ceramic bearings would really reach about 15mph over stock top speed.
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post #5 of 22 Old 07-29-2016, 02:12 PM Thread Starter
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Originally Posted by CKwik240 View Post
Less rotational mass isn't going to affect top speed. It will affect how fast you get there, but considering the weight of the bearing and its parts and its location (low inertial moment since its all near the center of rotation), the difference will likely be very minor. Lower friction may help with top speed, but if you can top out your gearing with OE bearings, then lower friction bearings won't do a damned thing. If you're geared such that you can actually hit an aero limited speed, then possibly.

My 2015 hits about 80-85 indicated at 8000 RPM. At 16K redline, it should be double. This does not account for any errors in the speedo. 160 to 170 seems reasonable depending on how much error there is. Of course actual ground speed may be a little different if aero drag is significant. There could be some tire slip occurring up at high speed that could cause a difference between indicated and actual, in addition to the speedo error. But in such a case, gearing limited top speed would result in lower top speed than the calculated top speed.


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That's a post directly from their website of course I don't believe everything a "seller" says about their products. It does make since with less friction it should move more freely. Re gearing and bearings are two completely different things, gearing won't give you a faster "top speed" I know. But I assume it's possible bearings could in fact reach higher top speed mph's. To what extent, who knows. But like stated, the gps and speedo were matched all the way to about 120-122 when I had to back off of it. And I assume since it has had a speedo correction on it with those ceramic bearings, I believe it when it says I'm doing 173 I really am. Lol
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post #6 of 22 Old 07-29-2016, 02:13 PM
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Must have been a fun ride,, I have about a hundred pounds on you and 4 inch's.
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post #7 of 22 Old 07-29-2016, 02:39 PM Thread Starter
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Must have been a fun ride,, I have about a hundred pounds on you and 4 inch's.
It is. I don't do it all the time but I do see what she's got every now and then!! I got a video, I can post it to YouTube and attach the link here. I recorded it on my GoPro to prove to my friend lol
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post #8 of 22 Old 07-29-2016, 02:45 PM Thread Starter
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https://youtu.be/9KRSgPSt5Bw

And for the record I was trying to run out some gas that had been sitting in my tank, lol that's why my fuel light was coming off and on

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post #9 of 22 Old 07-29-2016, 05:15 PM
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Originally Posted by Indy View Post
Since the track I run at has about a half mile straight doubt I'll ever find out.
Made it to 140 or so that's about it.

Is it possible, sure just about anything is possible.
Put a nice small rider half my size, long enough straight, no wind have my doubts.

Then I remembered a web site Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator

You load your bike and they do the math for top speed in any gear with stock gearing and allow you to change sprocket sizes to see what you gain.

There site shows a new Ninja 2015 tops out at 155.6
That does NOT take into account any factors like drag etc just gearing and red line.
177.8 MPH at 16k redline
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post #10 of 22 Old 07-29-2016, 07:30 PM Thread Starter
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177.8 MPH at 16k redline
Cool that's my actual top speed now? I mean yeah when I let out there was still technically 2k rpm I just don't like red lining the bike.
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post #11 of 22 Old 07-29-2016, 08:45 PM Thread Starter
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177.8 MPH at 16k redline
My bad I read that wrong. You also have ceramic bearings and that's what you topped out at? So yeah maybe a little difference in our conditions mine being at 173 with just a little more to go I'm sure I could squeeze out 177 I just haven't been like "in" redline. I bring it right too and back off. Still sweet tho thanks Man!
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post #12 of 22 Old 07-30-2016, 02:25 AM
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Cool that's my actual top speed now? I mean yeah when I let out there was still technically 2k rpm I just don't like red lining the bike.
I don't think the bearings really make any noticeable difference is my educated guess.

And no that's the calculated top speed from that calculator. Not accounting for wind and drag and rider weight
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post #13 of 22 Old 07-30-2016, 03:27 AM Thread Starter
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I don't think the bearings really make any noticeable difference is my educated guess.

And no that's the calculated top speed from that calculator. Not accounting for wind and drag and rider weight
Ahh ok well lol like stated, I'm a feather weight. No wind that night to increase drag. And gps seems to confirm it at least up to 120mph!
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post #14 of 22 Old 07-30-2016, 03:47 AM
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Wind and rider weight is only one of many things that will reduce true speed from calculated speed. Doesn't matter if there's no wind at all, at 100+mph you will be pushing through a lot of air resistance, then there's drag/friction from the road etc etc. I'd be very surprised if it was anything close to 170+ mph
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post #15 of 22 Old 07-30-2016, 05:08 AM
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Rear wheel speed is not going to be the same at 160mph as 120mph, the wheel will be spinning faster than the speed your traveling, and I highly doubt a 600cc bike can do 170mph, the tt super sport bikes just manage it and there highly modified.

Anyway it's about the corners not top speed
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