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  #1  
Old 08-19-2006, 12:15 AM
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Default 2007 kx 85 small or big wheel?

Giday all, haven't been on here for awhile.My question is the 2007 model kx 85 as a small wheel, can that be changed up to a big wheel when my young bloke is ready without changing swing arm etc ? It's just that the price of a small wheel is $5790 where as the big wheel is $5890, does that mean I can change from a small wheel to a big wheel for a $100 when I need to or what? Australian dollars that is.
I know you can change the ktm from small wheel to big wheel without any mod's but my son is a mad keen bubba fan so all he rides is a kx.
Thanks all.
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Old 08-19-2006, 02:32 AM
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Default Re: 2007 kx 85 small or big wheel?

someone has to know? I don't have the foggiest idea.

But I can say that you won't be able to just switch form small to big for $100 since the other bike will now be used.
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Old 08-19-2006, 02:46 AM
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Default Re: 2007 kx 85 small or big wheel?

If you can even get me a rim for 100 dollars Aus, I will move there. Tires, rims, spokes, and if the 85 uses the same swingarm as the KX100 you will need more than 100 bucks. In US figures if you bought it all (dont forget a sprocket and a shock spring) you would spend more like 1000 US to get the parts OE msrp.

When they are building the bike at the factory, it is very little more to build it bigger.
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Old 08-19-2006, 10:31 AM
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Default Re: 2007 kx 85 small or big wheel?

Quote:
Originally Posted by Geoff View Post
Giday all, haven't been on here for awhile.My question is the 2007 model kx 85 as a small wheel, can that be changed up to a big wheel when my young bloke is ready without changing swing arm etc ? It's just that the price of a small wheel is $5790 where as the big wheel is $5890, does that mean I can change from a small wheel to a big wheel for a $100 when I need to or what?
No, it means that when you buy the bike the larger wheels are only $100 more.

Once you bring it home, all bets are off.

With that said, this must be a Australia-only model as the Kawasaki US website only shows the KX85 with small wheels; you have to step up to the KX100 to get the intermediate size rims. If they do, in fact, offer the bike with both wheel sizes down there, I'd suggest asking the dealer what is required to put on the larger wheels. If it is a bolt-on affair, you might get away with just having a new pair of rims and some new spokes laced onto your stock hubs. But even that is probably close to $500 US with parts and labor.

One thing is for sure, $100 won't get it done.
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Old 08-19-2006, 05:16 PM
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Default Re: 2007 kx 85 small or big wheel?

Hey thanks everyone, I had a feeling that was going to be the case. It's just that there is a $100 bucks difference between the bikes brand new. I might be able to use that as a bargaining chip when I go into the dealers. Thanks again u all.
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Old 08-20-2006, 10:36 AM
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Default Re: 2007 kx 85 small or big wheel?

If it only requires a wheel swap, I'd suggest you buy the larger wheel model to start.

I'll bet you can find a set of the small wheels on eBay, or elsewhere, and pick them up for a reasonable price since most of the minis come with the small rims on them. Less bikes use the larger rims so they will be harder to find on the used market.

When he outgrows the small rims, put them back on eBay and you'll probably get most, if not all, of your money back.
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Old 08-20-2006, 11:35 AM
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Default Re: 2007 kx 85 small or big wheel?

Hey MTK that is a awesome idea, I never thought of doing it that way. I think I will do that. My son went for a ride on a small wheel 85 today and loved it, bike was perfect size for him but we all know how fast kids grow so a small wheel would probably only last him half a race season. Thanks again AWESOME idea.
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Old 08-20-2006, 12:43 PM
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Default Re: 2007 kx 85 small or big wheel?

The big wheeled 85s come with longer swinging arms etc. The hot setup is to buy a big wheeled 85 and run it with small wheels. Its meant to be more stable and handle better. That what the quick boys normally run.
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Old 08-20-2006, 02:13 PM
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Default Re: 2007 kx 85 small or big wheel?

Here in the US, we don't get a big-wheel Kawasaki 85 at all, so I can't say what they change to make it work.

I do know that the small wheels are downright spooky to me, compared to the stability the larger wheels provide. But at 37 I'm a bit old for an 85 anyway.
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Old 08-24-2006, 09:16 AM
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Default Re: 2007 kx 85 small or big wheel?

The only difference between the KX100 and KX85 big wheel (as far as I know) is the bore size. The larger wheel bikes do have a longer swingarm which I think is an improvement regardless of wheel size. I'd buy the big wheel bike and a set of small wheels rather than the other way round. You can also bore the motor to 100cc if you like. If you want even more out of it you can stroke it to 48mm IIRC - which should work out to about 105cc.

have fun
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Old 08-24-2006, 10:54 AM
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Default Re: 2007 kx 85 small or big wheel?

Thanks for that bikepilot, in our area the race classes are from 65cc the next bike is the 85cc and then on to the 125 or 250 four stroke, there is no 100cc class as of yet. Reading all of the replies I am convinced now, I shall be buying a 85 big wheel for sure. Thanks everyone.
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  #12  
Old 08-24-2006, 12:11 PM
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Default Re: 2007 kx 85 small or big wheel?

In the US the big wheel class is seperate from the regualar 85cc class and allows upto 112cc I belive. This is probably why the US model KX big wheel has the larger bore size. Its actually not a lot faster on top as it seems they didn't change the porting any from the 85cc cylinder, but the middle is filled in a bit. Depending on the weight of your rider, you might find the stock suspension too soft - its worth taking the time to set it up properly. The race tech spring rate calculator is a good place to start. R&D racing makes fork springs up to .39kg if you need them - they also make a trick replacement rear linkage system that gives a bit more travel and in theory should make the bike ride better. I installed it on my wife's KX100, but don't have a spring to match yet. The replacement link increases the leverage raito on the stock, requireing a stiffer spring to get the correct sag numbers. I think its probably most benifical for lighter riders.

Oh, one more thing to note, on the small-wheel version the forks are slide up in the tripple clamps a bit, on the big wheel version they are essentially flush (excluding the caps) with the upper tripple in stock configuration. I find that even with the large wheels you can slide the forks up in the clamps a bit for quicker turning, just watch that the tire doesn't hit the underside of the fender/lower tripple when the suspension is compressed.

have fun

Last edited by bikepilot; 08-24-2006 at 12:17 PM.
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  #13  
Old 08-24-2006, 03:25 PM
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Default Re: 2007 kx 85 small or big wheel?

Be careful trying the run the BW with small wheels in the Ama races...there are several things, like wheel base, that wont fly in the regular 85 class. Tdub
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Old 08-24-2006, 04:57 PM
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Default Re: 2007 kx 85 small or big wheel?

Quote:
Originally Posted by FFRacing11x View Post
Be careful trying the run the BW with small wheels in the Ama races...there are several things, like wheel base, that wont fly in the regular 85 class. Tdub
Since he lives in Australia, I think he's safe from the AMA rules problems.
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  #15  
Old 08-24-2006, 06:22 PM
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Default Re: 2007 kx 85 small or big wheel?

Quote:
Originally Posted by mtk View Post
Since he lives in Australia, I think he's safe from the AMA rules problems.
The post was not directed towards Geoff.
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