Tyre size, profile and rim size. Is bigger better?

[nzspokes]

Ive got 18" rims. 215 x 18 rear and 185 x 18 front.

Ive got Sport Demons in 110 x 80 rear and 100 x 90 front. It looks a bit unbalanced.

As spares I have 1 x 110 x 90 rear sport demon and 1 x 90 x 90 MT75.

All tyres are in great condition. Should I fit the 110 x 90 on the bike to match the front?

Does profile make a big difference?

And the big question, does a wider rear tyre grip better or does it just weigh more and slow the bike down?

[James Deuce]

You do whatever you want. You blindly disregard the knowledge and expertise of skilled engineers who design suspension systems for customers around the world, so I'm betting you know more than any damn tyre company.

[bogan]

Here's (http://www.kiwibiker.co.nz/forums/showthread.php/134079-Another-tyre-size-thread-this-time-with-physics) one I prepared earlier :bleh:

[nzspokes]

Here's (http://www.kiwibiker.co.nz/forums/showthread.php/134079-Another-tyre-size-thread-this-time-with-physics) one I prepared e.arlier :bleh:

Cheers, interesting read. :yes:

Must remember to use search function. :facepalm:

I kinda want to put the smaller MT75 on the front but not sure how old/hard/any good it is. The sport demons feel good.

[FJRider]

Cheers, interesting read. :yes:

Must remember to use search function. :facepalm:

I kinda want to put the smaller MT75 on the front but not sure how old/hard/any good it is. The sport demons feel good.

Changing tyre profiles (on the front) may affect speedo accuracy ...

[bogan]

So much tyre talk everywhere I would doubt the search would help.

Basically, the main thing you want, is to have profiles that work well together, different manufacturers have different profiles which don't show up in the figures. Mixing brands and sizes makes it harder to get that match, my guess is the mismatch will be most evident in turn in, and perhaps alter the force required on the bars during cornering. Dunno though, I run a matching pair ;)

[nzspokes]

Changing tyre profiles (on the front) may affect speedo accuracy ...

True. I use a back up bicycle speedo that is very easy to calibrate to any tyre size.

[nzspokes]

Dunno though, I run a matching pair ;)

Which I want to as well. I may sell my spare tyres and buy an 80 profile front to match the rear.

[MikeD400]

You do whatever you want. You blindly disregard the knowledge and expertise of skilled engineers who design suspension systems for customers around the world, so I'm betting you know more than any damn tyre company.

Jerry! Jerry! Jerry! :corn:

Ps: Your foot note makes me lol.:yes:

[nzspokes]

Ps: Your foot note makes me lol.:yes:

Didnt notice that before. LOL.

Some people dont know they are being wound up.

[MikeD400]

Some people dont know they are being wound up.

Haha, amen to that brother, good to know you've got a fan base tho!:rockon:

[nzspokes]

But anywho, how wide a tyre can I fit to my 215 rim?

[bogan]

But anywho, how wide a tyre can I fit to my 215 rim?

I thinking I'm missing some nomenclature here, but what does the 215 refer to?

[nzspokes]

I thinking I'm missing some nomenclature here, but what does the 215 refer to?

My rim has 215 x 18 on it. I presumed that 215 was the rim width?:blink:

[Kickaha]

But anywho, how wide a tyre can I fit to my 215 rim?

Personally I wouldn't go wider then a 110 but have put 120 wide on them before

Going wider wont make it handle any better

[nzspokes]

Personally I wouldn't go wider then a 110 but have put 120 wide on them before

Going wider wont make it handle any better

Cheers, thats what the bike is speced for so I guess Honda knew what they were doing.

[bogan]

My rim has 215 x 18 on it. I presumed that 215 was the rim width?:blink:

Nah won't be that, as you wouldn't be putting a 110 or 120 wide tyre on a rim 215 wide, would look horrendous, and handle even worse!

[Taz]

Nah won't be that, as you wouldn't be putting a 110 or 120 wide tyre on a rim 215 wide, would look horrendous, and handle even worse!

It is rim width ya bogan. Rims are measured in inches 215 is 2.15 inches bead to bead.

[bogan]

It is rim width ya bogan. Rims are measured in inches 215 is 2.15 inches bead to bead.

Now I get it! In my defense, that decimal point makes a big difference :innocent:

[Gremlin]

Ive got Sport Demons in 110 x 80 rear and 100 x 90 front. It looks a bit unbalanced.

As spares I have 1 x 110 x 90 rear sport demon and 1 x 90 x 90 MT75.

All tyres are in great condition. Should I fit the 110 x 90 on the bike to match the front?

Does profile make a big difference?

And the big question, does a wider rear tyre grip better or does it just weigh more and slow the bike down?
1. Why would you fit a tyre to "match" the other tyre? Bikes may take the same tyre, usually, the tyres are different front and rear... you do know the numbers mean things right?

2. Yes, profile makes a difference... a car tyre wouldn't allow a bike to lean...

3. Yes, a wider tyre should grip better (all other factors remaining constant) because there is a bigger contact patch. Profile not changing, yes, a wider tyre can slow a bike down, but it's re changing direction not outright speed.

[avgas]

Get a 300 section bro. And a turbo sticker

[nzspokes]

Get a 300 section bro. And a turbo sticker

Im not flash enough for a turbo sticker.

But fitted the 110 x 90 which is wider than the 110 x 80. Seems good so far and sits much nicer at 100.

Im sure my neighbours didnt mind me doing that at 5.30 this morning. :facepalm: