9 posts • Page 1 of 1
I am having so many flats at moment
That I thought might be interesting to
See what tyres people in Hobart are
I'm averaging 160 km a week. A mix of bike track, city and country road, eg bonnet, new norfolk, etc.
But have had 12 flats in last 6 weeks
Running 120 psi on vittoria zafiro as I am 102kg.
Mostly pinch flats.
Mostly pinch flats?
If that is the case, I think you should be asking "why am I getting pinch flats?" rather than looking at tyre brands.
Pinch flats are almost entirely caused by hitting pot holes in the pavement, or careless tyre fitting.
Are you hitting potholes? If this is the cause, the puncture will be evident within a very short distance after the pot hole.
If it is incorrect fitting, try this:-
A bike wheel, like a car wheel, has a well in the middle, lower than the ledge that the tyre sits on when inflated. The circumference of the well is less than that of the ledge, because its diameter is less. The well is there to enable tyre removal and fitting, and the process requires that the tyre bead be off the ledge, and located in the well. For the tyre bead to go down into the well, the tube needs to be dead flat. To achieve this, deflate the tyre. Then work on the side of the tyre that is going to be removed first, and go around it and press the tyre bead off the ledge, down into the well. Now press the valve stem, and a little more air will escape. While holding the valve down, use your other forearm to squash as much of the tyre as you can. A little more air will escape.
Repeat the procedure of pressing the bead toward the well.
Use a tyre lever to gently "just" get under the tyre bead ("just" means you are capturing the tyre bead only, and NO tube) and lift the tyre bead. Hold the lever in place, and now do the same with the second tyre lever, about 60mm from the first. The bead between the two levers will be up to the top of the rim; use a thumb to hold it there, remove lever#1, and repeat procedure about 60mm from lever#2. One or two more lever movements will have the bead comfortably off the rim. Now use fingers only to remove the rest of that side of the tyre. Do not use a lever like a knife, and slide it around the rim to get the rest of the tyre off; It might look impressive to onlookers, but not as safe as using your fingers.
You have the tyre off safely now, ready to remove the tube. Start opposite the valve, and remove the tube, carefully removing the valve as the last step of the job.
This was not your problem , so I will be brief:-
NO TYRE LEVERS
Slight tube infation
Start fitting tyre opposite valve.
When tyre fitted to a point where it is "too tight" to go further,
Deflate tube, and follow procedure ,as in removal, of repeated pressing bead down into well, and defating.
With the tube dead flat, and the bead in the well, enough slack will appear to enable the rest of the tyre to go over the rim.
Push the valve high up into the rim while the tyre goes on at that point. This keeps the tube high, so that it does not get caught between tyre bead and rim ledge.
Before inflating, squeeze the tyre away from the edge of the rim at the valve site to ensure it is not trapped under the bead.
If you are getting pinch flats from hitting potholes etc they will almost always be snake bites ie 2 holes. If not then follow the advice from master6 and you will be ok. I also run Conti gp 4000s. great wet and dry grip with a smooth ride. Not too heavy at 206gm. Done 6000k on this set. Back tyre near shot but front still ok. Had probably a dozen flats with them, all from glass on the bike track and all north of grove road. I have been running 120psi but now running 100 back 90 front as I have seen it mentioned that it should help prevent glass cuts. Will see how it goes. If you don't mind a bit of weight then I can recommend bontrager race lites. Did 8000k on a set with only one flat due to a large rusty fish hook penetrating the side wall because some bogan thought it funny to chuck a handful on the bike track.
If thay truly are snakebites then the only solution beyond not hitting holes and kerbs hard is a tyre with a bigger bag.
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011
I ran GP4000 Red Chilli (rear) and a Scwalbe Ulteremo R1 (front) on my wet weather bike and x2 Michelin Pro Race 3 on my race bike. I havent had a puncture yet on my wet weather bike, and only two using Michelins in 2000kms. I run between 120psi and 145psi. It could be a combination of different things, pinch flats, not running enough pressure, glass in the tyre still?
9 posts • Page 1 of 1
Who is online
Users browsing this forum: No registered users