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Discussion Starter #1
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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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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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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Discussion Starter #4
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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Discussion Starter #5
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.


The allure of going faster with less energy is appealing to almost anyone and the latest innovation to make bikes go faster is ceramic wheel bearings. Since the speed of a motorcycle is most determined by the performance of its rotating parts, investing in ceramic wheel bearings by Worldwide Bearings is a logical choice for the serious rider. Look for them in the winner’s circle.

Set includes 2 front and 3 rear bearings
Quicker elapsed times and higher MPH’s
Ceramic bearings offer 40% less friction than steel
Less friction = More horsepower
60% less rotating weight
Low tension, maintenance free dust seals
Mobil® Polyrex® light weight aerospace grease
Bearing life 3 to 5 times longer than steel
Lower vibration levels
Cooler running
No extra maintenance required
2 year warranty
Worldwide Hybrid Ceramic Bearings utilize SAE 52100 high-carbon chromium steel races, this air-melted alloy is clean, hard, and wear resistant, combined with Grade 5 Silicon Nitride balls. All ceramic bearings come with low friction removable seals.


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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Discussion Starter #7
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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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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Discussion Starter #11
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 :bigthumb: thanks Man!
 

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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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Discussion Starter #13
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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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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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 :satisfied:
 

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1000's are rated at 175ish stock... power/weight/drag

Without a GPS and a camera its a bit hard to continue the discussion.
 

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With my totally stock '09 i made a top of 171mph, not redline, no GPS.Speedo reading.Found a 4 mile straight highway part, no intersections, while on trip.
I stopped trying for more since it wanted like half a minute to go 1mph up.No more power left.

Taking into account your mods, you probably hit that top.
But i think that the bearings only help with accelerating faster, not top speed.
 

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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.
Aero drag goes up at the square of velocity.... very sharp increases with speed. This is why 'dustbin' fairings were outlawed in the 1950's.... an air-cooled parallel twin with ~50 RWHP could go so fast it outpaced the brakes, suspensions and frames of the day. The present fairing designs all harken back to that FIM decision to slow the bikes down, by increasing drag.

You'd have 200+ HP liter bikes that were as fast as Bonneville streamliners if the 'dustbins' came back and were brought up to current standards of design.....
 

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Your speedometer, like all instruments, becomes less accurate at the extreme ends of its range. Just because your GPS and speedo match at 120 does not mean that they will at the top end.

I don't mean to rain on your parade but it is unlikely in the extreme that you are getting anywhere near 170mph mark without substantial gearing changes as well as lightening the bike. The engine simply does not have the stink to reach those kinds of speeds as the drag from the motorcycle itself will overcome the available power.

The only way to prove this is to actually top out the bike with a GPS recorder in place and I would caution you to actually record the run on video with the speed showing because otherwise you will get no end of shit from literally everyone on the planet when you start claiming that your 600 does those kinds of speeds.

The quest for speed is a long and glorious one. I have many friends that spend their summers on the Bonneville salt flats so while the allure of straight line speeds does very little for me personally, I understand the attraction. Be safe about it and good luck in your quest.
 
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