This Is odd?

[Boon 51]

I have a rather odd tale to tell.

I have a new Bad Boy 2 hybrid with Kojak 28cc tyres fitted and a road bike with Durroguard 23cc tyres fitted and a standard foot pump and due to my bantum weight I'm happy with 6.5 bar at rear and 6 bar on the front.. so all OK at the moment.

So now I've changed the Kojaks on the hybrid for Gatorskins 25cc tyres and new tubes (23cc/25cc.)

The funny thing now is I can only pump up the Gatorskins to 3 bar and the tyre is at maxed out but the tyre is rock hard.

I let the front tyre down on my road bike and pumped it up to 6 bar then let the Gatorskin down but maxed out at 3 bar again..
So its the same pump but I cant get past 3 bar but its still rock hard on 3 bar.

PS.. On the Gatorskin box it said pump tyres a too minimum 6.5 and max at 8 bar.. but I cant?
Anyway I road the Bad Boy and all seems well.. well amazing really.

 

[Banjo]

Have you checked your gauge on the pump is accurate?

 

[Boon 51]

Just about right I think, but its just odd about the 3 bar max on the Gatorskin and its alright on the others.

 

[Banjo]

Really is odd. Could it be something up with the innertube valve?

 

[Boon 51]

Good call
I'm off on a ride tomorrow but at the week end I might just try another tube and see what happens..

 

[akb]

My guess is inner tube valve. I brought some innertubes from Go Outdoors on a whim and all three of them had issues with the valvue in that the pin was stuck once you achieved a certain pressure.

 

[Ningishzidda]

Pump the tyres up.

Lean over the bike's saddle and put all your weight on it.
How much do the tyres budge out sideways?

If the tyres are at 3 bar ( 43 psi ), they will flare out like they're flat.

 

[Boon 51]

My guess is inner tube valve. I brought some innertubes from Go Outdoors on a whim and all three of them had issues with the valvue in that the pin was stuck once you achieved a certain pressure.

The more I'm thinking about it the more I think its the valves/ tubes are duff.

 

[akb]

What tubes are they?

Also, it maybe time to upgrade to a decent track pump with gauge? I upgraded from foot pump and makes a lot of difference?

 

[Boon 51]

Pump the tyres up.

Lean over the bike's saddle and put all your weight on it.
How much do the tyres budge out sideways?

If the tyres are at 3 bar ( 43 psi ), they will flare out like they're flat.

I did lean the over the bike as suggested and all is well and I went for a long ride and it seemed OK..

 

[Boon 51]

What tubes are they?

Also, it maybe time to upgrade to a decent track pump with gauge? I upgraded from foot pump and makes a lot of difference?

When I got the Gartorskins (25cc) they were on offer so I got 2 Gatorskins and 5 tubes Conti's so they might be old stock or something like that.
The other thing I noticed when they arrived is that they are 42mm valves not 60mm which are a bit short but should'nt make any difference I would of thought.
Plus a new pump might be in order as you say.

 

[akb]

IME conti tyres come with conti tubes which are pretty decent. You may have some duff ones. Maybe contact the seller and have a chat?