Hi

Anyone CBR 125cc owners here that agree with me that the wheels on the CBR is kinda small/thin?
I'm planning to buy wider wheels ( at least the rear wheel ) . Anyone here who knows if it's possible to increase the wideness from 100 to 120? Will this gonna get meany problems when i'm riding my bike? Someone here who knows how much it gonna cost?

 

I asked the dealer the same question. The tires are skinny because at those speeds and weight you dont need more. It also allows you to roll the bike and lean it much faster.

Wider tires would decrease top speed and lead to an increased possibility of hydroplaning due to overly broad weight distribution.

 

Ok, thanks.

You say that wider tires would decrease top speed. I know that, but it won't probably be any problem with that. I've had my cbr 125 in 119 kph(between 73 and 75 mph i think), but here i Norway, there isn't any roads that allows people drive faster then 100 kph(even though people drive up to 130kph some places, lol), and with wider tires, I guess I won't have any problems reaching 100 kph.

 

You're not thinking properly about this.

Your bike weighs what we call 'jack sh*t"- something like 250 pounds or about 114Kg.
Ever seen a dirt bike? See how skinny the tires are? Yes thats to cut through dirt, but also because the bike weighs very little, and you don't want to overspread the weight.

Bigger bikes have fatter tires. They also weigh double what your bike does, and go more than double the speed.

If you go with bigger tires you will lose:

some speed
some acceleration (not only do you cut wind less, you also literally spin up the tires slower, as they are fatter and therefore heavier)
some aerodynamics (smacking wind with fat tire vs skinny)
some leaning speed (when you lean to turn the bike will react slower)
inferior traction ( not enough weight per square centimeter of tire to 'grip' the pavement)
inferior handling in rain (decreased weight per area=easier to slide or hydroplane)

you will gain:

NOTHING. Except it'll look better.


Sure you're not allowed legally to go over 100. Same here in Canada- but everyone does 130+

Have you tried driving along in traffic thats doing 130 when you are only doing 100? Its a lot more frightening than doing 130 along with them- or having skinny tires

Put your money into ground effect lights, a loud, pimped out, fat exhaust, and some nice decal work, and nobody will notice your faggy tires

 

Hi guys, I'm new.

Your talking about putting new wheels on, correct me if I'm wrong but that would mean you'd need a new swingarm?

Phil

 

Guess not if the tire fits in, but im not sure. I ain't an expert on that area.

 

Hi, I got CBR 150 R which is identical with 125 R, except mine in 150cc, with carb not EFI, and different look fairing. and it made from same factory (Thailand) you can see in here picture.

Originally my bike fitted with 100/80/17 tire on back, but i changed it with bridgestone 120/80/17 with no problem at all, actually it handle alot better than the factory fitted one, just make sure you use 120/70/17 one so you don't have to change the chain, i made mistake by putting 80 ones [] so i have to change my chain. but the handdling is far more better than factory fitted.

Here are some pictureof indonesian CBR 150R club's bikes, I haven't got mine picture taken, maybe latter

 

man, i didnt know they really made a 125cc...you say it does 75? thats pretty impressive....
this bike is obviously not available in america eh?

were all fat here and that thing would do like 45 with one of us on it....

 

hi there!

i'm a CBR 150R owner, and i'd like to share some tips about tire choices...

basically, the 125/150 will accept up to 100/80 or 110/70 front, but the ideal size would be 80/90 (stock) or 90/80. Bridgestone's BT39SS have both sizes.

the rear accepts 100/80 (stock), 110/70, 110/80, 120/70, 120/80, and 130/70. the best would be to go with 120/70. you won't have any issues with tire weight and clearance. popular choices here are Bridgestone's BT45, BT39 (not 39SS), BT090, BT014, or BT92. on these sizes, they're only available as front tires, but as far as our experiences tell, there's no problem on mounting front-use tires on the rear.

with 120/80 or 130/70 (especially on stock, brand-new, tight chain), there's only a few millimetres of clearance left between the tire and the shock absorber's lower mount. any wider and it's overkill (fitment issues - not to mention cost issues also).

the solution for 120/80 or 130/70 rear would be to change the chain. many CBR 150 owners here go with 428H 120 chain. RK, DID, and Osaki, are the most popular brands among 150 riders. it is actually possible to use stock chain, however it won't last long with such big tire. over time, with stock chain & big tire, one of the problem(s) you'll get would be that when the chain is tight at some point and loose at some other point, despite having it tightened all the way possible.

 

Hi, I know this isnt about the tyre sizes but i have a CBR 125 in Repsol colours and i want to buy a new set of wheels in orange as i have seen other bikes with this (mainly 600s) and i like how it looks. does any one know where i can buy them and how much it will cost me?

I have inserted a picture of Pedrosa's bike to show what i mean.

Thanks, Jon