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Discussion Starter #1
180/55, 190/50, or 190/55

just curious, my service guy put on 190/50 instead of 55 which was on the bike previously (dunlop Q2's)

wondering if i'll feel the difference

appreciate any responses and opinions, i ride canyons/track mostly on this bike. not a commuter bike for me :)
 

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oe size, because the honda boffins thought that was a good idea :) if they thought that was a good size then who am i to disagree ?
 

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Discussion Starter #4
well bermo, there is room for change in regards to tires. you're right, the engineers at honda know what they're doing no doubt, but the CB is a bike that gets ridden in lots of different ways (touring, commuting, canyons, track, etc) and that's why the tire companies make different sizes and types depending on your riding habits. for me, the CB is more of a track/canyon bike than a tourer/commuter. so i tried the 190/55 rear and loved the stability and big contact at lean angles. my service guy put on the 190/50, not sure why other than to be closer to the OE size, and i have not ridden it much yet on this tire but i loved the 190/55 so i guess we'll see. i was just looking to see what other CB owners use and why
 

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Discussion Starter #6
I was lead to believe that sqeezing a 190 on a 5.5 inch rim would actualy reduce the contact patch but not sure ? Anyone know different ? Thought it needed a 6 inch rim ideally
well on dunlops site the 5.5 inc rim is recommended for 180 but 190 would be "acceptable" according to them, so i guess it's a choice

oem was 180, changed those pretty quickly as i'm not a bridgestone fan, went to 190/55 and loved them, my service guy put on 190/50 and i'm not sure since i have not ridden them yet but will a ton this weekend and will report back, but wanted ot know what others use and their experiences/differences, etc
 

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Discussion Starter #7
well on dunlops site the 5.5 inc rim is recommended for 180 but 190 would be "acceptable" according to them, so i guess it's a choice

oem was 180, changed those pretty quickly as i'm not a bridgestone fan, went to 190/55 and loved them, my service guy put on 190/50 and i'm not sure since i have not ridden them yet but will a ton this weekend and will report back, but wanted ot know what others use and their experiences/differences, etc
ok, since very few of you seem to be interested in the rear tire size discussion, i'll see how it rides and maybe report back. maybe there's less enthusiasm for this subject because i'm american and this forum seems to be heavily populated by brits :confused:

ciao!
 

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ok, since very few of you seem to be interested in the rear tire size discussion, i'll see how it rides and maybe report back. maybe there's less enthusiasm for this subject because i'm american and this forum seems to be heavily populated by brits :confused:

ciao!
I guess cos tracks in canyons are usually banned and I think we've pretty well run out of canyons. ;) :respekt
 

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Discussion Starter #9
sorry, track days AND canyon riding. mutually exclusive geography. at least i THINK that's what you meant. translation may get murky over the ocean. we speak the same language no? kinda at least :)))
 

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ok, since very few of you seem to be interested in the rear tire size discussion, i'll see how it rides and maybe report back. maybe there's less enthusiasm for this subject because i'm american and this forum seems to be heavily populated by brits :confused:

ciao!
sorry but i lol when i read this !! i'm also on the aprilia forum which is 98% yank and i have never felt that way :) imho the tyre debate has a lot to do with how , where you ride ie freeways , mountain roads etc i prefer the standard tyre size because it turns in quicker and where i live the roads require that , and since i have no intention of going near a track day i'll stick with what i've got cheers :)
 

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Discussion Starter #11
thanks bermo, as i said, i enjoyed the wider profile of the 190/55 at track and in canyons/mountain roads. that's where i ride the CB the most, bigger the contact patch the better and i'll sacrifice some turn in speed for that. but it's a personal choice you are correct. i'm curious to see how the 190/50 feels as it's a rounder profile and shorter tire, will let you know after the weekend. i'm headed to ride for a few days and will do a one day riding clinic down in san diego but taking the longer route to enjoy some of the twisty roads nearby (ortega highway and palomar mountains for all you california riders).
 

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I've test rode 190/55 and 190/50 back to back on two different Fireblades. The 55 seem to have faster handling and would tip with less effort. I found slow speed countersteering fast to the point of being nervous but I'm sure it something you get used to. Didn't ride either that hard but I would imagine the 55 would be more suited where you have to change direction very quickly.

The 50 though suited me better though the tip in was more 'controlled' and as I am a short arse and a 50 having smaller diameter I was just more comfortable getting my feet down. Also do you not get a inaccurate reading on speedo?


Not sure if my eyes where deceiving me but the 50 looked like a wider tyre, I like bigger rears :D
 

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ok, since very few of you seem to be interested in the rear tire size discussion, i'll see how it rides and maybe report back. maybe there's less enthusiasm for this subject because i'm american and this forum seems to be heavily populated by brits :confused:

ciao!
Aye up ! - I think the reason we've not joined on this thread as much is that the UK CB1000R only comes with a 180 fitted and it seems general consensus that it works the best and is best suited to the 5.5" rim - there's also an issue with insurance - if you crashed with anything but the manufacturers standard sizes on you could find any claim being disputed as the bike had been 'modified' ... either way though it is still interesting to see what you guys have found out..
 

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I thought the only benefit of the 190 is that it looks better. Similarly when a bikes standard tyre is a 190 people sometimes fit a 200 for cosmetics but it doesn't benefit the bikes performance in any area. Am I wrong in this?
 

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180 is best in my opinion for road use - much nimbler. The 200 doesn't drop in as quick as a 180. In theory you need to lean to a greater angle on a wider tyre for the same radius corner. Wide tyres look nice and have a bigger contact patch, but not necessary on a bike with the power of a CB.
 

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thanks bermo, as i said, i enjoyed the wider profile of the 190/55 at track and in canyons/mountain roads. that's where i ride the CB the most, bigger the contact patch the better and i'll sacrifice some turn in speed for that. but it's a personal choice you are correct. i'm curious to see how the 190/50 feels as it's a rounder profile and shorter tire, will let you know after the weekend. i'm headed to ride for a few days and will do a one day riding clinic down in san diego but taking the longer route to enjoy some of the twisty roads nearby (ortega highway and palomar mountains for all you california riders).
respect mate . there are few people that can have a conversation on forums and respect each other , it's so easy to dis each other with key board warriors out there , i wish i could bring you here to understand how evil our roads ae here in wales , that is what i love about this forum , hwyl fawr , that's have fun in welsh :)
 

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Not sure if my eyes where deceiving me but the 50 looked like a wider tyre, I like bigger rears :D
My sentiments exactly, I know on a 6in rim the 190 spreads out nice and wide.

Rebod any chance you can post a few pictures as suggested with your report. Thanks, awaiting pics when you get time.
 

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Me too would be really intrested in the results mr honda might fit 180,s but he has been known to fit lots of parts people bin and replace but lets wait and see , think youre rite bout insurance though
 

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Discussion Starter #19
ok i'm back from a weekend riding and doing a skills clinic on the 190/50. let's just say i will never put on this size tire again. to make a long story short, OEM is 180/55, it was fine but i tried a 190/55 (wider tire, taller tire, more V shaped profile), and loved that tire, bigger contact patch and seemed to fit on the 5.5 inch rim just fine (Dunlop Q 2's). Dunlop site says 180/55 is preferred size for 5.5 inch rim but 190/50 or 55 is "acceptable."

as for the 190/50, i think the 5.5 inch rim further skewed the tire to an even rounder, flatter profile. at the clinic, we used an iphone to measure the sidewall angle on my bike's tire and another bike's tire that was also a 190/50 but on a 6 inch rim. my sidewall angle was 18% and the other bike's was 37%. without getting into the math too deep, what that means is i would have to lean my bike over about 72% to use the entire tire's profile, while the other bike would use his entire rear tire by only leaning the bike over 53%. at 72% leand you are crashing, 50% is quite a lean in an of itself. that definitely explained why i had about 1 inch on either side of unused tire but was just as leaned as other bikes there who were using their entire tire.

regardless, i could care less if i have unused tire or not, the bigger issue was the 190/50 gave me no confidence on it's ability to hold a line, stay planted in a turn, turn in quickly, etc. and the rounder profile versus a more V shape means the contact patch is smaller than even a 180/55 and certainly smaller than a 190/55. when i called dunlop to ask about it, they told me they had not put in nearly as much research and analytics into the 50 as the 55, that the 50 was a bit outdated and the 55 is what they have focused more of their attention towards. additionally, if you google "190/50 vs. 190/55, you will not find ONE person that prefers the 50 over the 55 so it was no suprise i did not like this tire.

so tomorrow i'll be bringing my bike back to the shop to get a new rear tire, question is do i go with a 180/55 or the 190/55, will advise. but do NOT put a 190/50 on a CB, ever!

hope this helps
 
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