06-15-2014, 12:37 AM
(05-29-2014, 02:56 AM)Red Mist_imp Wrote:(05-29-2014, 02:31 AM)CIP57_imp Wrote:Clearly embossed on the spokes of the CB1100's rear wheel are the markings: "18MC x MT4.00".(05-29-2014, 01:59 AM)Red Mist_imp Wrote: BT23, a radial for modern sport/touring motorcycles. They came as OEM on my FZ8. They are a good tire for sport/touring, with touring as the primary focus. They can handle a lot of weight but have a very stiff carcass. Bridgestones typically are quite stiff, as those who follow MotoGP will know. They take a long time to warm up and aren't especially compliant at high lean angles unless the pressure is set correctly and they are fully heated. Bridgestone is the spec tire for MotoGP, so all competitors must use them. My GSX-R had the BT016's OEM, same story, very stiff carcass, poor feel on the street, takes a long time to warm up, and will never warm up on the street at listed pressures.
Both those bikes are now fitted with Dunlop Q3's, a vastly superior tire in all respects. Not a good choice for the CB1100, though, which brings me to the point here.
The CB1100 is an old-school motorcycle that works best with a certain design and size of tire; modern, wide radials are not the right choice for it. Honda chose the 110 and 140 front/rear for the optimum handling and ride quality. A narrow tire provides very neutral handling, as well. The farther the contact patch is offset from the centerline of the motorcycle at lean, the less neutral will be the handling. Anyone who rides the modern machines (those with 120/70-17 front and 180/55-17 rear or larger) knows the handling is quite different from motorcycles with narrow wheels/tires like our CB1100, once the bike gets heeled past 20 degrees or so. The handling is much, much different nearer to maximum lean angle and requires a different riding technique from old-school machines. Bump steer in particular is markedly different, with a lot more of it being fed into the chassis with the modern sizes.
The chassis and suspension of modern bikes are designed to work with wider tires effectively but our CB1100 doesn't have these design features. It's optimized for old-school tires and narrow rims. This is something to keep in mind. Instinct says to us, "Well, let's find a new, modern tire to put on our CB1100", but in truth, today's tires which are made in sizes for our CB1100 are indeed modern in design; they just fit narrower rims. We can get radials or bias-ply tires that are a perfect match for the CB1100 from quite a few manufacturers, Bridgestone, Avon, and Continental coming quickly to mind.
Bridgestone does make tires for our bike, but the BT023 and similar types are not in that group. The 160/60-18 rear, according to Bridgestone's fitment chart, is designed to work best on a 4.50-5.00 inch rim. Our bike has a 4.00" rim, and the maximum size recommended for that rim is Bridgestone's own 150/70-18, which can be had in the BT45 bias-ply or (in European markets) the BT54 radial.
We can put on a wider tire but to what advantage? The contact patch is no larger, as it is determined only by the tire pressure and the weight of the motorcycle. With a larger width on a too-narrow rim, we move the contact patch outward more with increasing lean, where it's less compatible with the bike's design and changes the handling and performance of the motorcycle.
I have to respectfully disagree. The old school cradle design frame is run on the ZRX1200 which i recently sold. It was running 17" rims and full on sport tires. Although the bike didn't handle that well it was much better with a pair of pilot powers on it. The CB has a more rigid frame and lower center of gravity the the ZRX. The rear rim is 4.25 not 4" ( i have measured it)which is within the limits of a 160 rear. We don't know for sure unless we experiment. I will have a full honest review in a couple of weeks.
I personally do not like Bridgstone tires, i had mine switched out to Michelin on my CB1000RR at 500 mi.
In the north there seems to be more and more liquid tar being put on the cracks of roads. When your grooving a line and hit these with the CB its scary as hell. You either have to slow down or run wide to decrease the risk of sliding outside. I'm hoping a tackier tire will minimize the effect.
That's a 4.00" wheel, measured according to DOT specifications. The manufacturer's recommendations are based on the DOT method of measuring the wheel and the wheel size must be clearly marked on the wheel itself.
We don't need to experiment but we often want to. Motorcycle engineering is a highly-advanced technology and it is now well beyond what any ordinary rider can command or exceed. Because of this the manufacturers can provide exactly the right equipment to allow us to ride safely and still reach our own personal limits.
If anyone here can drag his/her elbow whilst riding the CB1100, please post images; the GSX-R 750 can be ridden at elbow dragging speeds by an expert rider on DOT tires (not I, for whom knee sliders must suffice) and it's a street-legal motorcycle. The CB1100's capabilities are not even remotely close to the GSX-R's, which shows us the gigantic margin for safety that today's equipment provides.
Personally, I say if someone wants to experiment with the limits of what a motorcycle can do, take up track days or road racing. Grinding down a knee slider can do wonders for one's self-confidence, and it can be done with OEM-spec tires these days.
OEM tires are fine for cb1100, it handles well and changes direction quickly.
Bad tire, sorry...
