Motorcycle Cornering Clearance – What To Do When It Runs Out


Once again another great article giving some good advise when out riding.  Corning is so important and at least knowing what can be expected could save you from that OMG freaking out moment.  Nothing is a guarantee but awareness is priceless.  Even on ADV bikes this can happen.

SOURCE:  Motorcycle.com

Strategies for safely handling corners when hard parts touch ground

By Evans Brasfield October 15, 2013

Newsflash: Lean a motorcycle over far enough in a corner and something other than those black, round, sticky things we call tires is gonna touch the ground.

While sportbike riders may scoff at motorcycles with lesser ground clearance than that allowed by their proctologist’s crouch inspired riding position, all motorcycles will drag something – even some riders’ elbows – when cranked all the way over.

On the street, cruisers and some standards will run out of ground clearance at a pace attainable by mere mortals. Many experienced riders can tell stories about riding in a group with a wide range of riding experience and ability when, suddenly, a rider who’s riding a bit faster than usual scrapes a peg or floorboard and gets startled. What happens next determines whether you’ll all be laughing it up at the next stop while everyone gets to see the scuff marks on the formerly virgin peg feeler or waiting around for someone to go get a pickup to haul a bent bike and its (hopefully just embarrassed) rider home.

Proper Motorcycle Cornering Technique

This rider is doing everything right. He’s not distracted by the grinding going on under his boot. Note how his foot is placed so that the peg will drag first.

The anatomy of such a crash is fairly simple. The rider, startled by the sound and vibration of metal contacting pavement, instinctively stands the bike up. Often the rider will then just run the bike straight off the road because he’s caught in the horns of a powerful – if inaccurate – dilemma. His brain is telling him he can’t lean the bike over even though it is now almost completely upright.

Motorcycle Downshifting Techniques

Target fixation is the other most common cause of running off the road after being startled by touching down. Come on, every one of us has faced the all-consuming focus on that object in front of us that… we… absolutely… do… not… want… to… hit.

If we are able to recognize – in the moment – that this fear-induced brain lock is going to send us right into the object we want to avoid, then we can force our attention back to our desired path of travel.

Motorcycle Cornering Sparks

The spark show that you put on can actually startle riders behind you. Remember, unless you touch down something solid, like a muffler, you can still maintain the current lean for the remainder of the corner – or even lean the bike a tad further if necessary.

Here is a place where racers and track riders have an advantage over street riders. While the track is, in many ways, safer than the street, the environment does give you close proximity to surprising events like a rider low-siding and sliding out away from you mid-corner. This type of sudden distraction can give you the opportunity to learn to pull your attention back to the task at hand without the additional static of oncoming traffic or large immovable objects at the edge of the pavement.

Cruisers, by virtue of their low and forward-mounted pegs and floorboards, are most susceptible to dragging. The good news is that the manufacturers have designed these bikes to contact the ground with folding parts before something solid, like the pipe or frame hits. The bottom of most pegs have some sort of protrusions termed “feelers” that provide warning that available ground clearance is running short.

All this means, that if you’re dragging flexible parts in a constant-radius corner, you could continue on the same path at the same speed – provided the pavement is smooth – with no problem. The last thing you want to do is chop the throttle or abruptly brake since you’ll immediately lose ground clearance as the weight shifts forward.

Motorcycle Cornering Track

Most of us picture a leather-clad rider on a track when we think about touching down hard parts. The reality is that many bikes can at street-reasonable speeds. A proficient rider should prepare for this possibility.

While current generation shaft-driven cruisers have minimized the shaft effect, older models would lose considerable ground clearance from rear end squat on deceleration. Softly sprung bikes will also touch down sooner over rough pavement or in high speed sweepers as the suspension compresses. (The Zero S we tested this year is a prime example of how cornering clearance can be compromised by a soft suspension.)

Proper Motorcycle Lane Positioning

Suspension compressing after going over a dip in a corner is a pretty common way to drag things, and unfortunately, the abruptness of this suspension movement makes it more likely to touch down a non-flexible part, giving the chassis a momentary jolt.

Pay special attention to forward-mounted footpegs that angle your feet so that their heels are prone to dragging. All it takes is having your boot pulled off the peg one or twice before you find yourself moving your heel to the peg prior to entering a corner.

Cruisers aren’t the only bikes that can cause you to drag your boots. Riders of standard or touring bikes can sometimes drag the sides of their boots before the pegs touch down. (There’s a reason why boot manufacturers put toe sliders on the outside of racing boots.) Riders who hook their heels on the pegs and flex their toes downward can actually cause a crash if they catch their toes hard enough.

Touring Motorcycle Cornering

Even riders of touring rigs should consider foot placement for spirited riding. A rider who is unaware of the possibility that his boot may touch down is more prone to surprise. Some experienced riders use the edge of their boot as a feeler gauge. Look for the beveled edge on the outer sole of fast guys.

When your bike touches down, it’s completely natural to twitch and slightly upset your bike’s chassis and line through the corner. A good way to minimize this reaction is to go out and purposely drag the pegs/floorboards. If you have access to a large, clean parking lot, go ride in circles at a moderate speed. (Do we need to remind you that you should be wearing proper gear in case of a tip over? We thought not.) Once you’re settled, try dipping the bike in for a short duration additional lean.

After you’ve found the point where the bike grounds, try extending the drag a bit further to allow yourself to become more accustomed to the sensations and sounds. Since you’re in a controlled environment, you can push it a little too far to feel how the character of the grinding becomes harsh as solidly mounted parts hit the pavement. Be careful not to go any further, or you risk levering a wheel off the ground, causing a crash.

Motorcycle Riding in the Wind and Rain

The further forward on the bike that the solid hit occurs, the bigger the risk of lifting the front wheel. Think back to your high school physics class. The front wheel and the rest of the chassis are at opposite ends of a lever with the contact point on the ground acting as the fulcrum. The part with the most weight on it (the engine) will use the fulcrum as the pivot point to raise the front wheel. Cue the sounds of shattering plastic.

Motorcycle Cornering Knee Drag

In the context of dragging parts, the reason why track riders hang off their bikes becomes more apparent. By moving their center of gravity lower to the inside of the turn, the bike can remain more upright – and give more ground clearance – for any given speed.

So, what’s a rider to do upon discovering that the corner has a decreasing radius or that the bike is simply traveling too fast for the tightness of a curve and has begun to drag its pegs/floorboards?

You really have two choices: alter your line and/or reduce your speed. If the shape of the corner allows, widen your line for the remainder of the turn. If that is not possible, you’ll want to slow down or, at the very least, not go any faster. For experienced riders whose bikes don’t have linked brakes, the best method for slowing down is to maintain a neutral throttle while carefully applying the rear brake. This scrubs off a bit of speed without dramatically shifting the weight forward. Traction for braking is limited in a turn, so a good bit of finesse is required of this maneuver.

All riders are surprised the first time they touch down out on the road. How much you’ve prepared for the event will dramatically improve the chances of responding appropriately and having a good chuckle about it afterwards.

4 thoughts on “Motorcycle Cornering Clearance – What To Do When It Runs Out

  1. Mixed thoughts on this. I have no problem dragging pegs when I am trying to do it but I always think that if I am simply travelling and drag a peg unintentionally i probably was going into the corner too fast or was not prepared for a decreasing radius or tightening corner.

    Here is a link to a classic example at Deals Gap of the wrong way to go through a corner. The fellow is focused on getting his picture taken and likely begins his turn too late, drags some metal and scares out, stands the bike up and runs into the car. Note not a single skid mark and the car is close to stopped (except for movement trying avoid the crash) when they make contact. http://xtremesportsphotography.photoreflect.com/store/Orderpage.aspx?pi=0QAK01AY080000&po=0&pc=28

    • Just to clarify that i fully agree with the article, but if you are dragging metal often and being surprised by it, then it is time to slow down or go do some track practice. I normally pay close attention to the speed limit signs going into corners on marked highways. In my experience on dry pavement the US ones are about right but in Canada I normally convert kph to mph. Have only been really surprised once or twice.

      • I think the article is raising awareness about what do if you drag a leg or too and the goal is not to panic. I personally don’t do it in purpose but when I had my CBF1000 it was tempting.😉

    • Agree and also if you are scraping pegs/feet/hard bits on an adventure bike (or any other high ground clearance bike) on a public road you are generally travelling far in excess of the speed limit.

      My experience in Canada (I lived there for a good number of years) is that you can double the recommended speed on most bends up to 10% over the limit quite safely and easily (with good, dry conditions)… in the US about 1.5x the recommended speed, again up to about 10% over the limit. It seems in Canada the recommended speeds for corners are about appropriate for a car on compacted snow with proper winter tyres – this was my experience having travelled the Vancouver to Edmonton route at least 5x in the snow.

      Poor chap in the photos, but a good example of how a couple seconds of distraction can end badly.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s