Bosarge22 Posted February 4, 2013 Share Posted February 4, 2013 Has anyone ran a 190/55 on a 6th gen? I have some Dunlap GPA's that I ran for a few track days on my CBR that are just sitting. I run slicks most of the time on the CBR for the track and have 2 sets of rims to switch back and forth. This late spring I'm going on a bunch of rides with friends up in the mountain twisties and was thinking about the extra grip the GPA's would offer on the VFR. Thanks Link to comment Share on other sites More sharing options...
Member Contributer CornerCarver Posted February 4, 2013 Member Contributer Share Posted February 4, 2013 Probably would offer a bit of extra grip due to the compound but the slower turn in would drive me crazy. I don't think you could ower the front enough to get back to the stock turn in much less quicken it. I would stick with a 180/55, even in a sport/touring compound. Since you have the tires basically, mount one up and give us a back to back test with a 180...both at proper air pressure. Link to comment Share on other sites More sharing options...
timmythecop Posted February 5, 2013 Share Posted February 5, 2013 I once put a 190 on my Buell S1 (stock size is 180) and it went from porky to big fat pig in a hurry. Link to comment Share on other sites More sharing options...
Rogue_Biker Posted February 5, 2013 Share Posted February 5, 2013 Putting a fatter rear tire on a wheel that was not designed for it will "round out" the tire and slow the bike's turn rate or "roll rate". Kind of in the same way that a rounded tire profile will slow the bike's steering/roll rate. That's the best I can describe it. The bottom line is, if the rear wheel is not wide enough to "spread" that fatter tire out to its proper width and profile shape, it will just slow your steering down. So don't do it. Unless you want to have the look of a fatter rear tire and don't care about the handling effects. Link to comment Share on other sites More sharing options...
Member Contributer Bassie Posted February 5, 2013 Member Contributer Share Posted February 5, 2013 My tire specialist told me once the simple answer: do not change manufactuer sizes, this is a bike not a car :D Sent from my GT-S5570 using Tapatalk Link to comment Share on other sites More sharing options...
Member Contributer KevCarver Posted February 5, 2013 Member Contributer Share Posted February 5, 2013 I dunno, but I just put a 170/60 on my '99... Link to comment Share on other sites More sharing options...
Bosarge22 Posted February 5, 2013 Author Share Posted February 5, 2013 The 190/55 is a higher profile than a 190/50. It will change the geometry by making the ass a bit higher. A lot of people are running the 55 for the track for a bigger contact patch. I tried it years ago for track days and after I got the Ohlins set up correctly geometry wise I have not looked back. The rim size on the VFR is 5."5 and the CBR is 6". The .5 difference is what has me wondering if this will be possible. That and will the tire physically fit under the rear fender. I have the tires just sitting for the use. I just did not want to do all the work and spend the money on flipping the tires to try it if I could find out if anyone has done it before. Thanks Link to comment Share on other sites More sharing options...
Bosarge22 Posted February 5, 2013 Author Share Posted February 5, 2013 Upon looking at the stock tire I realized there is no Tire hugger on the VFR.LOL. So vertically a 55 will fit. I guess I was thinking about how tight it is putting on tire warmers on the CBR with a 55. Link to comment Share on other sites More sharing options...
Veefer800Canuck Posted February 5, 2013 Share Posted February 5, 2013 according to Dunlop, the recommended rim width for a 190/55-17 race tire is 5.5" http://dunlopracing.com/tires-products/d211gpa/ but there is the whole downside to heat cycles, and the narrow operating range of a race tire in street conditions. dont even mention rain. Link to comment Share on other sites More sharing options...
Bosarge22 Posted February 6, 2013 Author Share Posted February 6, 2013 Thanks for the info. I have sport toured on the CBR many times with both the GPA's and the Michelin PP when it was doing double duty. You do need to make sure to take it easy in the twisties until the tires are warm and in the rain they do ok but don't shed water like a touring tire not to mention the low mileage you get out of them. But they are free so to speak and will not see the track again and still have a lot of tread.Especially the center. Link to comment Share on other sites More sharing options...
cookaboorra Posted May 9, 2013 Share Posted May 9, 2013 Definitely I would say: don't do it. The feeling of sturdiness you gain is balanced with a slower cornering in reality. And steering will change also, you will have a more "nervous" feeling than before, since front tyre won't play the same game than rear.I used to put a front tyre with a peaky profile on my Daytona to help a little, but geometry was more than an experiment, and I reverted everything to stock. Hope it helps. Link to comment Share on other sites More sharing options...
Alaskan Posted May 10, 2013 Share Posted May 10, 2013 6th Gens aren't what I would call "nimble" even with a 180! Link to comment Share on other sites More sharing options...
Baileyrock Posted May 10, 2013 Share Posted May 10, 2013 Can't hurt to try it, your obviously an experienced rider so no harm to try it out IMO. Link to comment Share on other sites More sharing options...
Member Contributer Switchblade Posted May 10, 2013 Member Contributer Share Posted May 10, 2013 I think it would be OK.. Link to comment Share on other sites More sharing options...
The Phantom Posted May 10, 2013 Share Posted May 10, 2013 We're still living in the past... one upon a time all these numbers actually meant something. Not now... go 10 or 20mm over, or under, use a different model of tyre, even go with different brands front and rear... it makes little difference in the general scheme of things. If the tyre fits and clears the swingarm, you're good to go. Don't sweat it. I remember a trip where my wife's Triumph TT600 did a rear tyre and we could not plug it - we put a Dunlop on the rear as the specified Bridgestone was not available. I had fanged that bike before the Dunlop went on, and I fanged afterwards, and there was no difference whatsoever. Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted May 10, 2013 Member Contributer Share Posted May 10, 2013 Well there are many differences in tyres. First up don't mix radials & crossplys, it will end in tears even on your car ! The profiles of most sport touring type tyres are pretty much the same, so changing brands will not normally cause any issues, but your mileage may vary on this. More sport oriented tyres normally have a steeper profile & these can feel odd when mixed with a sport touring tyre, so be careful of that, the effect can take place in a narrow speed range too, so just because its stable at speed X does not mean it will stable at speed Y. Link to comment Share on other sites More sharing options...
Guest Posted May 10, 2013 Share Posted May 10, 2013 I have ran a 200/5517 power one almost all the time on my deceased VFR,and on the above R6.The reason is a friend gives me his track tires which are just fine for the street. That tire carcass is really stiff (run @ 18 psi)aand deforms during acceleration out of the corner thus more contact patch.Realy works well but I couldn't justify the cost for the street but free just worked for me. So it fits it works but a little more work to tip the bike into a corner and all in all 180's a less expensive and work fine. Link to comment Share on other sites More sharing options...
Beck Posted May 10, 2013 Share Posted May 10, 2013 You have to ride pretty hard on the streets to adequately heat up those track tires......... Link to comment Share on other sites More sharing options...
Bosarge22 Posted May 10, 2013 Author Share Posted May 10, 2013 I guess I forgot to say that I have both front and rear GPA's ans will change out both, but the rear was a different size from stock hence this thread. The front is the same size as stock. Link to comment Share on other sites More sharing options...
Bosarge22 Posted February 26, 2014 Author Share Posted February 26, 2014 I put the GPA's on my VFR and have about 1000 miles on them. They feel SO much better then the stock Metzler's. I hated those tires. I'm not sure if the taller profile is helping turn or just the tire itself but dragging knee and hard parts on the big girl would be easy. Feels so much more nimble. I know I won't get a lot of miles on them but for free that's ok. I think I'll just keep cycling old track tires from the CBR to the VFR and save some money. Even slicks. Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2014 Share Posted February 26, 2014 I put the GPA's on my VFR and have about 1000 miles on them. They feel SO much better then the stock Metzler's. I hated those tires. I'm not sure if the taller profile is helping turn or just the tire itself but dragging knee and hard parts on the big girl would be easy. Feels so much more nimble. I know I won't get a lot of miles on them but for free that's ok. I think I'll just keep cycling old track tires from the CBR to the VFR and save some money. Even slicks. I have ran slicks on the front of the VFR for 4 years much better than another tire period.I run the michelin power cup v profile A compound on the gsxr750 best tire hands down. If you ever run it you won't run anything else. http://stores.sportbiketrackgear.com/Detail.bok?no=30993 Link to comment Share on other sites More sharing options...
Beck Posted February 26, 2014 Share Posted February 26, 2014 I put the GPA's on my VFR and have about 1000 miles on them. They feel SO much better then the stock Metzler's. I hated those tires. I'm not sure if the taller profile is helping turn or just the tire itself but dragging knee and hard parts on the big girl would be easy. Feels so much more nimble. I know I won't get a lot of miles on them but for free that's ok. I think I'll just keep cycling old track tires from the CBR to the VFR and save some money. Even slicks. I have ran slicks on the front of the VFR for 4 years much better than another tire period.I run the michelin power cup v profile A compound on the gsxr750 best tire hands down. If you ever run it you won't run anything else. http://stores.sportbiketrackgear.com/Detail.bok?no=30993 You get the best performance from racing slicks only if you get them to proper temperatures. Unlike on the track, street riding never really gets them warm enough to do so, I bet that in most cases you will still get better performance with good treaded street "sport" tires when riding on the street than on slick racing tires..... = racing slicks for street riding is mostly a waste of money.... Link to comment Share on other sites More sharing options...
Member Contributer CornerCarver Posted February 27, 2014 Member Contributer Share Posted February 27, 2014 I put the GPA's on my VFR and have about 1000 miles on them. They feel SO much better then the stock Metzler's. I hated those tires. I'm not sure if the taller profile is helping turn or just the tire itself but dragging knee and hard parts on the big girl would be easy. Feels so much more nimble. I know I won't get a lot of miles on them but for free that's ok. I think I'll just keep cycling old track tires from the CBR to the VFR and save some money. Even slicks. I have ran slicks on the front of the VFR for 4 years much better than another tire period.I run the michelin power cup v profile A compound on the gsxr750 best tire hands down. If you ever run it you won't run anything else. http://stores.sportbiketrackgear.com/Detail.bok?no=30993 You get the best performance from racing slicks only if you get them to proper temperatures. Unlike on the track, street riding never really gets them warm enough to do so, I bet that in most cases you will still get better performance with good treaded street "sport" tires when riding on the street than on slick racing tires..... = racing slicks for street riding is mostly a waste of money.... Unless you are using take offs from track days or races and they are free or 25% of new... from your link Norton "Tire Warmers: The use of warming blankets is HIGHLY recommended with POWER CUP. The ideal use of would consist of heating to 176 ° F or 80 ° C for 30 to 40 minutes before riding the tires on the track to ensure the tire use is at its optimum temperature to ensure optimum performance." More good stuff in the link about how much to increase tire pressure for wet tracks and cold tracks... Regarding the original topic...try a 170 on the rear of your VFR and prepare to be amazed. Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted February 27, 2014 Member Contributer Share Posted February 27, 2014 Tyre warmers are great to warm your hands too!!! Unless there are better "options" to do so.... One simply has to keep an eye out for it.... Link to comment Share on other sites More sharing options...
Member Contributer gll429 Posted February 27, 2014 Member Contributer Share Posted February 27, 2014 every time i see this topic i scream... Link to comment Share on other sites More sharing options...
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