bluulantern That bike looks sick and its a 250r? Do you know if they show a list of mods on that bike? And those tires do look sick I have to agree.

 

Wicked, I would be keen to know what type those clip ons are as they are mounted below the top yoke which I didn't think there was enough clearance on the fairing to do that.
Very interesting...

 

Unfortunately, I only saw this in Facebook shares. I Do not know what kind of MODs was done on it. It is a CBR300R not a 250. Looking forward for more responds here.

 

The swing arm has been altered as well, I'm not sure you're getting much larger rubber on yours without a similar modification...

 

What size do you think the tire is? Do you think its custom swing arm or may be its a ready made after market swing arm?

 

What mods would have to be made to have a wider front tire? Would brakes have to be changed?

Also looks like the handlebars have been lowered compared to original.

 

It's a Honda swingarm, aftermarket rims, probably a bit wider and maybe a 160ish on it? Looks pretty sweet, but practically probably drives like crap. Slower and look at the right foot peg. Your foot is basically touching the exhaust can. The front brakes look bigger too?

 

No modifications needed i have a 160 on my bike and it fits with no problems, all these people that say the bike will feel worse is a load of crap. The bike feels a lot better, and you can still lean it into the corners. The only thing that i found is because i put a 160/60/17 my speedo is out a little bit. But the thing is you don't really have to change down in gear as much. You can just keep it in top gear. When i was doing 7000rpm my speed was around the 120km mark. Now it would be at 115kms But i like it. On the front it have a 120/60/17. And the bike feels just a little bit lower to.

 

No modifications needed i have a 160 on my bike and it fits with no problems, all these people that say the bike will feel worse is a load of crap. The bike feels a lot better, and you can still lean it into the corners. The only thing that i found is because i put a 160/60/17 my speedo is out a little bit. But the thing is you don't really have to change down in gear as much. You can just keep it in top gear. When i was doing 7000rpm my speed was around the 120km mark. Now it would be at 115kms But i like it. On the front it have a 120/60/17. And the bike feels just a little bit lower to.

So it sounds like the Honda engineers didn't know what they were doing when they spec'd the 140 for the rear and a 110 for the front.

"Feelings" aside, I'd be willing to put up the title to my CBR as a wager that one of these bikes will lay down quicker lap times on stock size tires than it can on oversized tires. How a bike "feels" with this tire or that tire is pretty subjective, whereas lap times are objective and will always tell the tale of how a given bike responds to changes in tires and tire sizes.

 

If you want to know about that modified 300 in the tri colour most of those parts are from a cbr 650

 

Who is talking about lap times. Who is talking about honda not knowing there stuff. I ride on the normal roads to work. Yes it is a different thing when you race your bike' but i don't. I just ride. Don't put words into peoples comments, just answer it as it is writen. If you have not tried it yourself how can you comment. People ask can i do this, and i want to do that, and i'm only telling them what i have experienced myself with my bike. When people start talking about lap times where in the post did i say anything about racing or lap times. A forum a for answering peoples question so if you read the question (How to fit a 160 tyre on a cbr 300r) So i answered it because i have done it. And i said what happen such as the speedo being out. Now it is his choice wether he does it or not. Sometimes on forums it is hard to get a straight answer. And all you get is a heap of opinions. And that does not help to get an answer for the original question.

 

Wow.

Sure seems as though you're being overly sensitive to my post, as well as a bit defensive when it comes to this topic of tire sizes.

So how did I "put words into your comments"?... I didn't. Nowhere did I say that your post made any reference to or about lap times. I simply stated an opinion, using the context of track testing to give my opinion some credibility.

As a senior Moderator here for these forums, I'll say this just once: Whether you happen to agree with another members viewpoint on a particular topic or not is immaterial. Anyone posting on these forums is entitled to have an opinion. What you are not are not entitled to do is post a follow up comment telling another member (myself included) that they have no right to voice their opinion, which is what your above post implies.

To put it another way, calling out another member for having an opinion you don't agree with isn't going to fly here. If you do this again, that post will simply be deleted.

 

Observing that picture in first post are you sure it is a 300r? I thought I spotted twin front brake rotors, plastic upper brake resvior, the rear brake caliper is upside down and the front forks are upside down?. if it is still a 300r it has had a lot of money put into it and these are just the first things I noticed.

 

Observing that picture in first post are you sure it is a 300r? I thought I spotted twin front brake rotors, plastic upper brake resvior, the rear brake caliper is upside down and the front forks are upside down?. if it is still a 300r it has had a lot of money put into it and these are just the first things I noticed.

This bike shown in the OP's photo also has non-stock wheels, which one could assume are wider than the stock OEM 250R/300R wheels, in order to accommodate the larger tires. It also has a different swing arm, which looks to be the aluminum unit as used on the CBR650F. Definitely quite a bit of money spent on all of those components.

If you look at the frame in the area above the rear sets, it's the same frame as used on the CBR250R/CBR300R... so the bike could even be an Asian market 2015 CBR250R (which shares the same body work with the 300R). The photo in the OP isn't sharp enough to clearly read the "CBRXXXR" decal on the side cowl.

Photos of the Asian/Indonesian market 2015 CBR250R...

 

yes the hole running gear of the bike has been changed. As far as i know its just a one off for a bike show, The new cbr 250 rr has a similar look

 

I just recently saw a cbr250 with a 180 on back. It fits just barely, about 2mm of clearence. Looked awful. Towards the edge the threads were near vertical so basically the last inch or so on each side was useless. Next time I see it I'll take some pics.

I would guess that the 160 is kinda like this too and the edge of the tread was at an angle that makes it useless. I don't see more then a 150, but width of rim determines tire width and as is stock is a perfect setup.

Theoretical numbers:
140/70 is 4mm larger in diameter then a 160/60 so not much of a difference. Just the thread wear alone is more then twice this difference. And a 180/55 is 2mm larger in diameter then 140/70.

Wider tire on rim meant for narrower tire will make it have a funny shape crown/profile. Will handle slower not lean over as evenly, be heavier so brake and acceleration will be worst. Waste more fuel, wear out brakes and drive faster. When I say lean over evenly, because of the crown shape, it will lean slow at first then suddenly be fast then suddenly you lose usable thread cause the angle is too vertical.

 

The tyre sits ok on the rim

 

Just looking at the extreme angle of the side wall of this 160/60 ZR 17 mounted on the stock wheel (lower right photo), it's easy to see that this tire is far too wide for the bead to bead rim width of the wheel. Then look at the shallow angle of the tire side wall before it's mounted on the wheel (lower left photo), which is close to what it would look like when mounted and inflated on a wheel with a proper sized rim width.

For correct fitment of a 160 size tire, that wheel rim width would need to be about a half inch wider.

Here in the U.S. (and I would think in most Western countries), no reputable dealer or independent shop would even consider mounting that tire on a 250R/300R stock wheel.

 

When you look at the tyre off the rim in real life the side walls are at the same angle. The actual beading is narrower than the rim. That's why i chose this particular tyre. The shape did not change on or off the rim. And that's a fact

 

Ride off as much of the chicken strips as you can and show us a some pics. I tell you that the edge of your chicken strip is about all the usable surface you have. The edge on that 160 is just toll vertical to be of any use.

 

Point taken but i like it. And it is ok for everyday riding to work. There are a lot of people with a 150 and 160 tyre on the rear. And they mostly just ride safe and at normal speed on the roads. It all about looks i think. I like the look of it. And if other people don't like it. so be it. It is a question that is asked a lot. And i think some people are not satisfied with the answer they get. So they just go out and try it. And they find it is ok. But we are only talking about road use. Not on the track. And i think that's is why there is a lot of confusion with answers. Just because one person puts a 160 tyre on there bike it does not mean it's a bad choice for them if they like it all good. But i know everybody is entitled to have an opinion.
So for the people that like the look and is not sure about which way to go.
listen to the people's comments and if you are not getting the answer you want. You have the option to just go and try it. Yes you may lose some handling and performance, but how fast do you really want to go on the public roads. Don't let killing yourself or someone else slow you down. Just enjoy your ride and how you want it to look.

 

motomike and other members may express their
opinion on any subject raised in this open forum..

raising a question or subject does not preclude
members from responding on any level
relevant to that subject..
this is not a court of law where one person
demands another to; 'just answer the question'..

novices and others use this forum to gain information
and so on as part of forming their own opinions
as to their motorcycles and thus to themselves
as motorcyclists..

there is room for all opinion,
not limited to any specific context
such as what any member thinks
'looks better'..

 

If you are a person that want's to go bigger on the rear. Before you do it just measure the beading of the tyre first, Just before they put the tyre on the rim. You will see if the tyre is pulled in or not. With my tyre it is the same shape on and off the rim.
There is many rim and tyre dementions tables out there. And if you look at one of them, you can see what you can and cant fit on a four inch rim. I really think the amount of people that want to change the rear tyre out number the ones that don't. But as i said before if you want to race your bike and do crazy fast lap times just stick to the stock size. With my bike when i was able to lean it over it was fast to react. Putting the bigger tyres on has slowed that down. Once you get use to it again. You will really notice not to much as a difference.

 

this is the thing,, that you or the rider needs to 'get used to' slower input
from oversize tyres, seems imo like accepting poorer performance
for cosmetic appearance based on looking like a bigger bike..

for me changing to pirelli sd tyres on cbr250r [after taking a screw]
then similar profile stock tyres on cbr300r included 'getting used to'
[or learning] the different - better - easier faster turn in and general
accurate steering based on the different tyre profiles..

members here and cbr250r forum esp novices but other riders
have complained or raised their problem of having to push
their bikes to enter corners or ride decreasing radius turns etc,
sparking discussions on counter steering and suchlike
steering techniques..

that 'problem' such as it might be, can be addressed by
tyre profiles and shape suitable for more direct
and quicker steering responses.. a good thing..

if you like or want slower steering, or see that as better
for novice riders etc, then its a different problem..
but otherwise it seems accepting the poorer steering
for the sake of perceived 'looks' related to
the look of larger capacity motorcycles..

for me its interesting that moto3 250cc singles
have smaller, tyres than our road 250cc singes..
not based on wanting to 'look like a racer',
rather that these very carefully designed
motorcycles are made to 'work better'
including steering and handling..

 

shisoshin i have a question for you. On normal day to day riding in the streets N.S.W of Australia how do they ride there bikes? i think mostly around those streets it only about 50 to 60km roads. And if you go out of town 70 to 80km, and that is sometime on the the high ways as well. so when you are doing these speeds how can you possibly see a difference. Or lean you bike down anywhere. You can not. So really the only time you would see a differents is on the track. But on the other hand where i live here in Thailand the speed are very different and you can push you bike harder if you wish, But there are more straight roads with less bends. The speed limit here is not marked but it is 80 or 120 and some road don't have a limit and that is where they do ride fast. They put the bigger and softer tyres on there bike here because of the road surface being so smooth, and when it is wet that extra rubber on the road helps you slow down and stop better. To be honest and this is from Honda in Thailand one of the reasons there is a 140 tyre and the 4inch rim is to keep the cost down. The is made for bigger rims. The 300 was going to come out with a 4.5 inch rim. But because of the sale war between yamaha and Honda. Honda could not put the bike out at a higher price to match yamaha because of the honda 300 lacking in the power area. And this is why next year the 250rr is coming. And it is going to be a nice and powerful bike for a 250. It will eat the 300. But you might see it a year after. The new bikes here CBR 150, 250, 300. They are have a top speed of around 180kms. It is only the difference in the power getting to the top speed. They a all running the same frame now here. The only difference is the 150 has a smaller tank, shocks, wheels and tyres. front body fairing are the same, but smaller tail fins. The 250rr is going to have a similar frame or it could be the same as the 500r. That is what is in the motorbike mags here. In the information and in getting the new bike this country is first. And then India. And all of the other countries see them 6 months or even a year after that. If you look at a KTM 290 they run a 150 on the back from stock and they are a smaller bike. And the wheel size is the same as a 300r The changers that John McGuiness made before he won the senior TT race. Was they put a bigger rear tyre on his bike. So sometimes bigger can be better. But many of the bike manufactures do run there bikes different as in tyre sizes. Gearbox gearing, and so on.

 

.....The changers that John McGuiness made before he won the senior TT race. Was they put a bigger rear tyre on his bike. So sometimes bigger can be better......[/COLOR]

Sorry, now I understand why you're so interested in larger tyres. Have you got your entry in for next year's TT?

I would wait till you get there and you've put a few laps in before changing tyres. McGuinness is very, very experienced round the Island circuit and holds lap records, so he's no doubt able to exceed the limits of the tyres. You might find that, at the speed you're going, you don't need more rubber.

Having said that, the IOM circuit has a very high average speed and few really slow corners, so steering speed probably isn't an issue whereas stability at 200mph is, so who knows?

 

Yes McGuiness did do very well in the senior race. I did get there this year, It is so unreal
you just cannot get over how quick they really go.

 

ONE OF THE BENEFITS OF A LARGER TIRE IS (oops>>) is a softer ride (bigger "spring") because it holds more air. Would help the woefully cheap rear suspenders on the 300s. Would be reason enough for me if I ever accumulate enough miles to need tires???

 

Nobody could say the CBR3s rear suspension is too firm, so why you would want more compliance in the tyre?. Besides, the spring in the tyre carcass is undamped.

 

the higher unsprung weight and increase rotational mass will take away and some what ever advantage of the marginally larger air cushion

 

It fits with no problem. I have a 160/60 17 and it firmed up the ride
No mods needed

 

Any pics or was a joke?

 

I would not however, rely on his recommendations vis the benefits/drawbacks, or the potential handling issues. I think for him it was mostly about street cred. That's not to say I know any better, just that you should fully consider the role that tyre width and profile plays in a bike's handling. Apologies if you know this already.