CB650R rear tyre width

[cryingman]

anyone of you folks tried to put wider tyre on the back, instead of factory recommended 180? i would like to install 190 or 200, so the bike look "solid" from behind? will it decrease performance or handling? i will be using bike for commuting - no track riding or racing- just normal everyday city/urban riding

 

[miweber929]

anyone of you folks tried to put wider tyre on the back, instead of factory recommended 180? i would like to install 190 or 200, so the bike look "solid" from behind? will it decrease performance or handling?

Yes, the bike will turn in slower and tend to fall into corners strangely; the rim is too narrow for a 200 and will probably be tight within the swingarm and rear hugger depending on where your chain is. It will also be heavier so your fuel mileage will most likely suffer.

The tire change will not make it look much more “solid” in the end. Your bike, however. It’ll look like a fat guy in a 2 sizes too small coat.

 

[Redrocket]

A good way to ruin the handling IMHO.

 

[FogDucker]

It's a very tempting modification, but it is not about the size only. It's the tire profile change that hurts your handling. go and look it up. 190 vs 180 and you will find lots of "never thought of" differences. Another caveat is the profile mismatch between your front and rear tires. they are not the same. The rear tire tends to lean faster and sharper but the front one does not cuz it has a duller (less convex in layman's terms) profile.

 

[Motojack]

This reminds me of the video of some guy who put a car tyre on the motorbike 😀

 

[Brian C.]

The Darkside....
Fortnine - Darkside

 

[troy]

Old topic but might be useful for someone.
I put 190/55 on my 21' cb650r, long research on different forums gave me an impression that people with track experience do it quite often while advises against 190mm on a 5.5 rim come mostly from riders who didn't try it which makes sense because bike manual says 180 only.
Deciding factor was that some tire manufacturers explicitly list approved rim width in their specs, Bridgestone, Dunlop has 5.5-6.0 for 190/55, so it can't be awfully wrong to use it, e.g. T32, S23 https://www.bridgestone.com/products/motorcycle_tires/products/detail/pr186
I went for michelin road 6, looks great and handles much better than oem dunlop sportmax, probably because its just a better tire and has less to do with additional width.
P.S. new rear is also lighter, 5,900kg 190/55 road6 vs 6,070kg 180/55 oem dunlop with 3mm thread left on it
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