Hitchcocks Forum

More times than I'd like I've had the rear end hop/slide for no good reason, when I didn't expect it. These have usually been on fairly slow tight corners where you have to lean 60° in a sharpish manner to get the bike round, not long sweeps; both on good and bad surfaces. It may be that this is also the point where one puts power on to get out of the bend kicking the back tyre out, but I could happily live without this behaviour.



The tyre on the C5 is the stock Avon AM26 Roadrider 110/80-18 at 29psi (Avon pressure), they're supposed to be quite sticky.



Is there a suitable tyre out there with more stick (no, I will not touch Pirelli).

Lean at 60 degrees, I think not.

60° to horizontal? Did I get it backwards, I tend to think bike angle to ground as reference plane. The bike will go over a bit further without scraping. I've done with knee-scrapers.



Even so, the bike is hopping out where it shouldn't hop out. Is it the tyre or should I be looking elsewhere? Methinks the tyre, and it has done this from new.

My rear AM26 started to act in a similar manner not that long ago but this behaviour stopped as soon as I tightened the loose swinging arm spindle nut!

My second AM26 on the B5 needs changing so I'm going to fit the AM20 Roadrunner instead in preparation for the winter. It has an extra 2mm more tread depth than the Road rider Just getting a bit fed up with tyre changing! Looks to be the Avon's version of the Dunlop K81 so I'm not anticipating any problems...

I've got a Roadrider on the back of the S2 Interceptor and it really sticks to the road well, you can bank into slow corners and power out with total confidence. I think the pressure you quote is a bit low, I'd give it another 3-4 psi and see what that does.

REgards, Mark

Jefrs,I would be interested to know your dislike of pirelli tyres as I thought they had a reputation as being the best of the bunch ?

Thanks Ric - I'll check the swinging arm. I also fancy dropping the bike in to Hayballs (dealership) to change the fork oil as it's a bread and butter job for them, apparently they have a range of different fork fluids to adjust operation.



Must admit I've not checked the swinging arm. In a way I'm glad you've also had the exact same problem; RoadRiders are supposed to be fairly high-end tyres. And yes, I've had a swinging arm go home before now, on a BSA. I'm also glad the RE is adjustable. And RE do have a reputation for self-adjusting nuts... I think my needle was stuck on the tyre

Albert, on three or four occasions Pirelli car tyres have tried to kill me with tyre faults, tread lifting off, broken belts, complete lack of grip on a wet road. Nearly but didn't hit a cyclist when one fell off the rim, brown trouser job. Spun-off onto a roundabout island when the belt failed. One tyre place said they would have returned the tyre to the manufacturer if it wasn't a Pirelli, unfortunately they saw failed Pirellis all the time. I can't trust them and won't have them on any vehicle. They made it a sale killer for the CGT-535 for me. YMMV.

Thinking back, I've felt rather than heard a clunk when the back end skips, that would be the swinging arm rather than the tyre letting go. Interesting!



Has anyone else noticed this phenomena?

Mark, the Avon site gives 27psi front and 29psi rear for these sizes of tyre. http://www.moderntire.com/modern/fitmen ... itment.pdf Your S2 is a bit heavier, and I'm a bit heavier than average too. What it is *not* is the 18/28psi given in the RE handbook, that is legacy from very old school tyres.