Big Bike tyres on Little bike?

[Fladdem]

Already thinking about getting a second set of wheels for the CRM, with roads on. I went out hooning last night with my mate, driving his mini around, and I just couldn't keep up, I just couldn't put the power down with the knobblies, she just kept lighting up.


Anyway, I was thinking about getting something like a metzeler tourance for the CRM but I'm not sure if they'd be too hard compound for a light bike like that, considering people claim to get close to 10,000 out of big heavy Adventure bikes. might be a bit skittish on mine.

Or just go full supermoto and bugger the cost...

What do you reckon?
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Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

[G]

Get a spare set of wheels whatever. If you can from a road bike like the gs500 or similar... Though will require a bit of bodging.
Otherwise, there's some ok road tyres in enduro sizes.

[stevo as b4]

If the brakes are ok for road use, and you don't want to have an SM set up for the tart/pose factor like most do, then I think just fitting a set of std sized wheels with road bike style rubber is fine and all you need to make a trail bike good and grippy on the tarmac.

I would expect that there is a BT45 fitment for your bikes wheel sizes, which should give you plenty of grip in all road conditions. The Continental Classic attack tyres on my KMX are the best mod I've made and give lots of grip too.

A trail bike will always look crap when fitted with smooth road tyres as people expect them to have big boss knobblies and be plastered in mud. But I don't care about how things look or image, I'm only interested in how well it works, as proven by some of the other vehicles I own.

[prawny1]

you can get road tyres for your current rims, how good they are for hooning round on is a different story.

I assume yours is the crm 125, might be easy enough to fit some nsr wheels, anything wider might leave you rubbing the chain and or swingarm
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hellkat wrote:

Some people are only alive cos its against the law to kill them.

[G]

It's the 250, but I don't see why it'd be any different to fit NSR wheels too - while the 125 has a rather poor engine for dirt (great for road, though), the rest of the chassis is a proper dirt bike.

[prawny1]

I was working on the assumption that the 250 may take a wider rim / tyres than the 250.

140 150 width seems to be the norm on bigger bikes converted to sm but without measuring the swingarm/ chain distance from the centre line I figured nsr wheels with 100/80 and 130/70 would be a reasonable choice, the nsr is single disc too.

For the bigger bikes people fit the cb-1 400 front and rear rims 3.00 wide front with big single disc and 4.00 wide rear good for a 140/70-17 (150/60 fits too 160/60 at a stretch)
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hellkat wrote:

Some people are only alive cos its against the law to kill them.

[G]

The 125 took normal enduro sizes. Seems to be similar width rear - best I could find is 4.6 width for the 125 and 120 for the 250, which is about 3mm wider.

[prawny1]

A 4.60 or 120 knobbly would have some side ways blocks I would think right? sounds like 130/140 17 road tyres might be about all can fit in then,

If you are talking like cats paw style tires that must be one narrow chain line/ swingarm.
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hellkat wrote:

Some people are only alive cos its against the law to kill them.

[Fladdem]

The brakes are dire, well not too bad, but the front disc is slightly warped and I think the pads need replacing, that and the knobblie tyre, just doesn't feel great.

Apparently XR400 wheels bolt straight on, and XR650, and they pop up more often and for cheaper than CRM wheels.

I can stick a 140/80-18 knobblie in the back, I have a spare one knocking about in the garden, it might rub when cornering and it flexes but something like this:

https://www.triumphrat.net/attachments/twins-talk/27326d1279958551-avon-distanzia-photo-0006.jpg

Shouldn't pose too much of a problem. Although I hate the distanzia I have on the back of my TTR250, it's such a hard compound, I have more slides with that than I do with a Michelin AC10, or my Pirelli MT43, which is gorgeous on and off-road but gets chewed through in no time, and you can't get it to slip around corners, like with a knobblie.

The Avon on the back of my TTR, does have a stamp saying it's from 2008 but also it doesn't have a lot of downwards pressure, my TTR just doesn't have the weight of a GS650 or something, so it feels really skittish, which is my main concern with these larger "dual-sport" tyres.

I'm not sure whether I like the look of supermotos though, the wheels just look so small.
____________________
Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

[G]

[Fladdem]