Possible tyre sizes

[woodentopp]

On a 31K, what are the largest tyre sizes that can reasonably be used?

The reason i as k is that I'm thinking of fitting spoked wheels and can find a fair few on ebay but don't know what the upper limit for sizes is?

[midlifecrisisrd]

Back in the day I used a 100 front and 120 rear. 130 rear would foul the chain run but easily sorted with an off set front sprocket.

RGV wheel in 31k frame has a 150 rear with offset sprocket, any larger and chain is getting too near the frame for my liking.

Steve

[bare]

I'd suggest that the rim width is the more important area to research first.
Too big a tire on a thin rim is far worse than a skinny tire on a thin rim.

[Deleted]

Hi my 250lc runs a 130 am23 on the back with no mods or hassle and a 3.25/3.50 on the front on 350lc rims

[tripodtiger]

Just looking at the tyres on my '81 350LC. I reckon they are on the small side? Standard wheels, afik.
Front has a 2.50 Bridgestone BT39.
Rear is a 100/90 Bridgestone BT39R.

The front has a cut in it, so definitely needs replacing.

Recommendations?
I'm around 110kg. Tyres will be for track days.

Shift the rear onto the front & get a 110/90 or 120/90 for the rear?

And I'm not looking for performance, yet. I want a correct size pair whilst everything else is sorted out.

[mboddy]

Nov 26, 2012 4:09:30 GMT 1 tripodtiger said:

Just looking at the tyres on my '81 350LC. I reckon they are on the small side? Standard wheels, afik.
Front has a 2.50 Bridgestone BT39.
Rear is a 100/90 Bridgestone BT39R.

The front has a cut in it, so definitely needs replacing.

Recommendations?
I'm around 110kg. Tyres will be for track days.

If you go too wide for the rims you get less rubber on the road and a bad profile.
Fat tyres are for looks. Thin tyres in race compound are to go around corners faster.

I won three NSW Titles on the same tyres you currently have.
I have been using Savas lately from Whites Racing Products.
The Sava 2.5" front will recover if you lose the front end but the BT39SS won't.
WRP will be selling a race compound Sava in 2.75" x 18" soon which will be just perfect for the front.
In the mean time I have a new race Avon in 80/90 x 18 for the front that I can sell you if you want.
On the rear the 100/90 BT39SS is good but my 250 has been using the race compound 90/90 Sava which is even better.

[tripodtiger]

Nov 26, 2012 22:35:09 GMT 1 mboddy said:

If you go too wide for the rims you get less rubber on the road and a bad profile.
Fat tyres are for looks. Thin tyres in race compound are to go around corners faster.

I won three NSW Titles on the same tyres you currently have.
I have been using Savas lately from Whites Racing Products.
The Sava 2.5" front will recover if you lose the front end but the BT39SS won't.
WRP will be selling a race compound Sava in 2.75" x 18" soon which will be just perfect for the front.
In the mean time I have a new race Avon in 80/90 x 18 for the front that I can sell you if you want.
On the rear the 100/90 BT39SS is good but my 250 has been using the race compound 90/90 Sava which is even better.

Got the fat tyres thing. I'm definitely not putting the rear tyre, turned around or otherwise, on the front. The 2.50 looks far too narrow. The rim stands wide of the shoulder of the tyre.

I looked at the parts book & it says 3.00 for the front, which is 90/90, I believe. 100/90 is a 3.25?

I'm started to think the biggest problem is actually GETTING tyres. The tyres I have metric sizes for are almost invariably listed in imperial measures, and vise versa.

I need a tyre for the back of my, not 12 month old W800. Ex factory it has a 130/80 Dunlop. That tyre isn't listed as available in the country. And the tyres within the K81 list that are, are given in imperial measures.
So, I'm getting a different tyre in the correct size. When the front wears out, I'll match the front & back together.

So, stick with the 2.50?

I'll wait till I get the p.o.s. running properly and then worry about learning to ride it and then worry about getting the best tyres to TRY and increase my speed. Now there's a fantasy ;D



And, just so you know, your email address bounces back. Have a look at you inbox here, you should find a message from me.

[Norbo]

what you need is 90/90 Front and 110/80 rear . some people do up a size and thats not to bad but it will turn in slower but ive seen some real big tyres fitted to bikes and they weev all over the place . so id stick to the standard sizes .