Is it bad to run a slightly smaller tyre?

[jafagsx250]

Was surfing the Internet for various tires and prices in preparation of getting new ones when the current one's wear out and came across a nz website biker bargains selling a set of Pirelli sport demon's for 300 bucks. The front tire is the same size as my bike's but the rear is a 140 70 17 rather than a 150 70 17.

Would this be unsafe? Is it better for cornering? I have had a Google search but nothing useful came up.

Thanks

[Ulsterkiwi]

dont know about unsafe, the smaller tyre will definitely make cornering different.
There are plenty on here who know more but my understanding is your tyre choice will be determined by the wheel you have on as much as anything. Some wheels will happily accommodate the slimmer tyre, some may not.
I would strongly suggest talking to someone who actually sells and fits tyres.

[jafagsx250]

dont know about unsafe, the smaller tyre will definitely make cornering different.
There are plenty on here who know more but my understanding is your tyre choice will be determined by the wheel you have on as much as anything. Some wheels will happily accommodate the slimmer tyre, some may not.
I would strongly suggest talking to someone who actually sells and fits tyres.

Thanks man. I will definitely do that when it comes to replacing the tires.

[AllanB]

You will find the slightly smaller tyre (10mm narrower) will also have less circumference so the engine will rev slightly higher for any given speed - ie say it sits on 4000rpm at 100 now it may spin at 4400 at 100 with the 140 tyre. On your GSX250 (?) you'll know if this will annoy you as the smaller bikes tend to buzz at high revs.

You'll find it accelerates slightly quicker as a result of the altered gearing as well, again with a small engine that tends to spin up quickly you'll be clicking through the gears slightly quicker.

The arse end of the bike will be slightly lower. You will find the narrower tyre will make the bike turn in quicker.

One thing I'd check - do you use all the rear 150 now - as in no chicken strips? If you are riding to the edge of the 150 I'd question the 140 as you may find she gets a bit squirmy on the edge of the smaller rubber.

Rim size - a Google will assist here - check the 140 is fine on your rim width (rim width will be cast on your rear wheel).

Years back I had to run a 120 instead of a 130 rear on a 750 as the larger size was not in the country. Went absolutely fine with the above to note - the most annoying thing I found was the higher revs.

Plus everyone knows fatter tyres just look cooler ;)

[jafagsx250]

I sold the gsx250 :( :bugger: . It was a good bike to learn on but wanted something newer to get to uni and around Auckland. So I got a 2008 hyosung with 4000 kilometers on the clock. Which now has the front brake permanently engaged. Which incidentally was why I sold my old one. (didn't want something which was going to be a problem child) So much for that bright idea lol. My brother had one with no issues so I thought I'd be sweet.

I spend a lot of time on the motorway and with the wet roads don't go to the countryside as much as I used to a couple months ago. I still have chicken strips on the 8 year old original stock tires as I don't trust them in the wet weather we have been having lately. On the dry they're fine so I am planning on getting new tires ASAP. Probably Bridgestone bt45 in the correct sizes for 420 dollars. They're only 30 bucks more than the sport demon's will cost all up. And with the harder center compound should last a decent amount of time on the motorway.

It seems to turn in pretty well as is but I don't have anything sporty to compare it to.

It does look pretty mint from the rear with the fat tire.

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[YellowDog]

You need to take care that you don't alter the balance of the ike. I guess it dfepends upon the sort of riding you'll be doing.

Allan's comment over the wheel speed, revs, gears, & acelleration are all correct. Your speedo will also show faster than you are actually doing :)

[mouldy]

If you are not getting to the edge of the 150 the 140 will be fine and you might be able to reduce your chicken strip . if you do get to the edge of the 150 you may drift the 140

[jafagsx250]

That's a good point. It seems to handle fine with the stock sizes and feels easy to flick into a corner.

It gets quite vibratory at 100 kilometers an hour. But being a hyosung I need am optimistic speedo lol.

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[mouldy]

Bridgestones are definetly the go for the Hyo . Front brake issues could be dry sliders or too much fluid in master cylinder . Always check level is below max mark

[jafagsx250]

Bridgestones are definetly the go for the Hyo . Front brake issues could be dry sliders or too much fluid in master cylinder . Always check level is below max mark


dry sliders the things that that the brake pads move along when the piston pushes it out of the caliper and onto the disc right?

The brake fluid looks fine. I'll have another check after work but I think I have narrowed the brake issue to the caliper not being completely straight. The brake pads are on an angle and not fully back in when the brake lever isn't pulled in.

[Asher]

Some food for thought.
I had a KTM RC390 which comes with a 150/60/17 from factory, but even at elbow dragging lean angles it would still have chicken strips on the rear tyre (non on the front). Lots of people (including racers) swapped the rear tyre to a 140 and it improved the handling and they could get rid of their chicken strips.

A Hyosung 250 has barely enough power to pull the skin off a rice pudding so a 140 should be fine in that respect, but the smaller tyre might sit flatter on the rim which isnt ideal.

If you have Chinese made levers they are notorious for causing your front brake to lock on.

[Crasherfromwayback]

If you are not getting to the edge of the 150 the 140 will be fine and you might be able to reduce your chicken strip . if you do get to the edge of the 150 you may drift the 140


Bridgestones are definetly the go for the Hyo . Front brake issues could be dry sliders or too much fluid in master cylinder . Always check level is below max mark

You need to stop reading internet forums. And start wearing a fucking bib.

[Crasherfromwayback]

Some food for thought.
I had a KTM RC390 which comes with a 150/60/17 from factory, but even at elbow dragging lean angles it would still have chicken strips on the rear tyre (non on the front)..

You too, need a fucking bib.

[jafagsx250]

Some food for thought.
I had a KTM RC390 which comes with a 150/60/17 from factory, but even at elbow dragging lean angles it would still have chicken strips on the rear tyre (non on the front). Lots of people (including racers) swapped the rear tyre to a 140 and it improved the handling and they could get rid of their chicken strips.

A Hyosung 250 has barely enough power to pull the skin off a rice pudding so a 140 should be fine in that respect, but the smaller tyre might sit flatter on the rim which isnt ideal.

If you have Chinese made levers they are notorious for causing your front brake to lock on.

they're the factory levers so i'm not sure if they're much better. it's getting fixed on thursday though. apart from the sticky front brake and old shinko's i quite like it for what it is.

[Drew]

You need to stop reading internet forums. And start wearing a fucking bib.
Glad you said it bro. I get it wrong sometimes, but these cunts just don't understand bikes at all methinks.

Regarding tyre size and increased revs for same speed. Circumference of the 150 is 66.3 inches. The 140 is 65.5 inches. Work the percentage difference of those two numbers, that's the same percentage of the original revs at a set speed that will increase. It's no where near 10%.

Will it upset the bike's handling? Likely not. Likely any noticeable difference will be entirely in the riders head.

Check what size rim the tyre manufacturer says the hoop can go on. They will give a minimum and maximum.

For the love of fuck, ignore your chicken strip. They mean fuck all! I've done a half decent lap on a couple different bikes when I thought I was a bike racer, and there seemed to be no correlation between getting to the edge and my lap time.

It's a pissing contest. Dreamed up by heroes who wanna wank on about how great the are on a bike. Dukie is the kinda fucktard that points out his lack of chicken strip. You DO NOT want to be like Dukie.

[Kickaha]

It's a pissing contest. Dreamed up by heroes who wanna wank on about how great the are on a bike.

Is that really Drew or did someone steal his login ? because it'd be the the first intelligent thing the cunt has said since he's been here

[AllanB]

For the love of fuck, ignore your chicken strip. They mean fuck all! I've done a half decent lap on a couple different bikes when I thought I was a bike racer, and there seemed to be no correlation between getting to the edge and my lap time.

I think the theoretical point was that if he does indeed use all the wider tyre now he would be on the edge more with a narrower one. Or off the edge!


I remember some years back I think it was a story with Aaron Slight talking about maximizing the sweet spot on his race tyres - this was the area lent over but about 20-25 mm in from the edge - where he could give it lots of throttle and keep under control. The fast part of the tyre when cornering.

[Drew]

I think the theoretical point was that if he does indeed use all the wider tyre now he would be on the edge more with a narrower one. Or off the edge!


I remember some years back I think it was a story with Aaron Slight talking about maximizing the sweet spot on his race tyres - this was the area lent over but about 20-25 mm in from the edge - where he could give it lots of throttle and keep under control. The fast part of the tyre when cornering.
Sill not how it works regarding getting to the edge of a tyre. Tyre rigidity is the biggest factor, and how it distorts when loaded.

But please, regale us more with tales of superbike riders and how their experience relates to a 12 horse power 300kg Hyosung.

[AllanB]

Sill not how it works regarding getting to the edge of a tyre. Tyre rigidity is the biggest factor, and how it distorts when loaded.

But please, regale us more with tales of superbike riders and how their experience relates to a 12 horse power 300kg Hyosung.

The Superbike tale backs up your comment on ignoring the chicken strip wank ya knob. He was not interested in the tyres edge for max cornering speed :weird:

[actungbaby]

Sill not how it works regarding getting to the edge of a tyre. Tyre rigidity is the biggest factor, and how it distorts when loaded.

But please, regale us more with tales of superbike riders and how their experience relates to a 12 horse power 300kg Hyosung.

yeah well i never heard of the somone falling of because ran of the edge of the tire sounds like world is flat idea. seemd good idea

at the time i never get no where touching the edges of the tread or touching foot pegs for that matter . ;-)

am crap at riding fast but just enjoy getting to A to B more concern for avoiding nuttas and bad drivers

Had this guy in 4 wheel drive last week get all road rage on my becuase get pissed people tail gatting me in my car.

I seen this guy before and frigin thing huge all see is this steel cage thing on the front in my rear mirror.

I taped the brakes bad mistake he roars up inside of me on single lane road . then follows me gets out walks to me drivers door

nuts of at me . all while am thinking f@##K am holding on to this door handle

[tri boy]

Fitted a wet slick to my 85 Camaro bobcat and boosted up the creek with 4 doz empty cody,s fly,n out the back, while hori pulled hard on some Te puke thunder to ease off the dodgy disco biscuits we got dealt by a lesbo road worker outside Opotiki.
The wet slick fired us across the lane, in to a sulky driven by a retarded brethren, looking for his lost chicken, that raped a stoat outside KFC.
The coppers showed up to to sort the brethren, but like most coppers got distracted, this time by multi coloured greek belly dances wearing costumes from Greta Garbos private collection.
Then the morning started to go down hill...............

[Madness]

Fitted a wet slick to my 85 Camaro bobcat and boosted up the creek with 4 doz empty cody,s fly,n out the back, while hori pulled hard on some Te puke thunder to ease off the dodgy disco biscuits we got dealt by a lesbo road worker outside Opotiki.
The wet slick fired us across the lane, in to a sulky driven by a retarded brethren, looking for his lost chicken, that raped a stoat outside KFC.
The coppers showed up to to sort the brethren, but like most coppers got distracted, this time by multi coloured greek belly dances wearing costumes from Greta Garbos private collection.
Then the morning started to go down hill...............

We should meet one day.

[AllanB]

Fitted a wet slick to my 85 Camaro bobcat and boosted up the creek with 4 doz empty cody,s fly,n out the back, while hori pulled hard on some Te puke thunder to ease off the dodgy disco biscuits we got dealt by a lesbo road worker outside Opotiki.
The wet slick fired us across the lane, in to a sulky driven by a retarded brethren, looking for his lost chicken, that raped a stoat outside KFC.
The coppers showed up to to sort the brethren, but like most coppers got distracted, this time by multi coloured greek belly dances wearing costumes from Greta Garbos private collection.
Then the morning started to go down hill...............

Shit - I'd go on a ride with you, you had me at Camaro.....

[WNJ]

Shit - I'd go on a ride with you, you had me at Camaro.....

Had me at wet :crazy:

[mossy1200]

Someone at Pirelli decided to put super corsa in the chicken strip zone of my back tire just to tease me and I am struggling to remove it now I have half left and it looks like aliens have sent a war declaration on my tires in a strange text. Maybe I should drop down to a 190 rear tire next time.

[AllanB]

Someone at Pirelli decided to put super corsa in the chicken strip zone of my back tire just to tease me and I am struggling to remove it now I have half left and it looks like aliens have sent a war declaration on my tires in a strange text. Maybe I should drop down to a 190 rear tire next time.

HA - got the same on mine - the newish rear I can claim the winter weather for my reduced pace thus the remaining text .... come spring ......


If I remember one of the Metzeler tyres had little marks relating to lean angle.

[mossy1200]

HA - got the same on mine - the newish rear I can claim the winter weather for my reduced pace thus the remaining text .... come spring ......


If I remember one of the Metzeler tyres had little marks relating to lean angle.

They stick like glue I think they are good for the full lean on a clean road.
Im wondering why they are only half worn at 2700 km the MV must have a great suspension set up. expected to see 2k max from the rear.

[mossy1200]

We got dildo probed by a lesbo road worker outside Opotiki.

But like most coppers I got distracted................


Interesting work story?

[actungbaby]

Shit - I'd go on a ride with you, you had me at Camaro.....

dont you mean el camcho thats what bestie boys sing or speak what ever they do .

I been in mates holdern manaroe superchared does that count shit loads wheelspin and tire smoke

[actungbaby]

HA - got the same on mine - the newish rear I can claim the winter weather for my reduced pace thus the remaining text .... come spring ......


If I remember one of the Metzeler tyres had little marks relating to lean angle.

That do wonders and the chain oil spray of works a treat too. had my cbr 900rr had rear down to the steel belts and bald front

to slids going to see mum at the cemetry front slid so gas it and then back let go happy memories ;-) up hill and on narrow road

woohoo thought was going join her was fun at the same time

[jafagsx250]

Thought I'd update you all. Didn't end up going with the cheaper smaller tire. The hassle of finding a day when I can get some one to bring the tires with me and the fact that the money saved turned out to be zero was more than out weighed by the dire need to get rid of the 8 year old original shinko tires. They were starting to crack and were harder than morning wood.

I ended up with Michelin pilot streets. The big boy at cycletreads with the Rhodesian Ridgeback recommended them. They were a fair bit cheaper than the usual sport demon's and bt45 etc but are also radials. They come stock on the new r 3.

He also said that they're based off of the pilot road 2. Not sure if true or not but should get good mileage out of them and compared to the shinko very good grip. Just need to run them in now.

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[AllanB]

Appears they are ideal for your bike. Bung some kms on them and post up a report.

http://moto.michelin.com/DC/en/tyres/products/pilot-street-radial.html

[jafagsx250]

I don't really have anything to compare them to as my last two sets of tires have been 5 and 8 years old........


But I'll do my best when I've put a decent amount of kilometers on them

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[rambaldi]

Thought I'd update you all. Didn't end up going with the cheaper smaller tire. The hassle of finding a day when I can get some one to bring the tires with me and the fact that the money saved turned out to be zero was more than out weighed by the dire need to get rid of the 8 year old original shinko tires. They were starting to crack and were harder than morning wood.

I ended up with Michelin pilot streets. The big boy at cycletreads with the Rhodesian Ridgeback recommended them. They were a fair bit cheaper than the usual sport demon's and bt45 etc but are also radials. They come stock on the new r 3.

He also said that they're based off of the pilot road 2. Not sure if true or not but should get good mileage out of them and compared to the shinko very good grip. Just need to run them in now.

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That is what I have on my bike. They are decent, and much better than the stock well aged rubber that they replaced. Don't have a lot to compare them to but seem reasonably planted, although I am not that much of a racer so pretty much anything new would have sufficed.