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VW-surfbum · **Posts:** 5060

SurferEv wrote:

One thing I learned recently regarding my Nobby Nic was importance of pressure.

I was trying to make sure I had the right tyres on for our Afan trip so did some reading on tinternet before we went.

The sidewall says min 30 psi so I had pumped it up to this or just over the previous weekend before our ride around Hadleigh. I had noticed though that the front end (where the Nic was fitted) seemed more skittish than usual. I then read that running it a few psi down, say 26-27, changes the tyre's behaviour so I tried this at Afan. Was a different tyre!! Felt so much confidence in the front end as it just seemed to grip all the way.

I've not had a chance to try on our local trails in anger but worth considering and I'll mention is to Del this evening

http://mtb.ubiqyou.com/

nwmlarge · **Posts:** 3548 **Location:** essex

unityjon wrote:

so that would make it 30psi under riders weight probably ? if you put a pressure guage on it and it says 27 whenyou sit on it the pressure will increase no doubt to 30 ?

just thinking out loud, may be bollox !

next it will be nitrogen filled to make it stable pressure when it heats up! :lol:

VW-surfbum · **Posts:** 5060

unityjon wrote:

so that would make it 30psi under riders weight probably ? if you put a pressure guage on it and it says 27 whenyou sit on it the pressure will increase no doubt to 30 ?

just thinking out loud, may be bollox !

you cant measure it that way as too many variables.
always do your tyres/shocks/forks unweighted

VW-surfbum · **Posts:** 5060

nwmlarge wrote:

unityjon wrote:

so that would make it 30psi under riders weight probably ? if you put a pressure guage on it and it says 27 whenyou sit on it the pressure will increase no doubt to 30 ?

just thinking out loud, may be bollox !

next it will be nitrogen filled to make it stable pressure when it heats up! :lol:

They do, but not tubeless as it dry's the sealant out.

SurferEv · **Posts:** 924 **Location:** Westcliff-On-Sea

And using the link provided by VW above and all my parameters for Nic on Front I get.......... 26psi..

Cool

unityjon · **Posts:** 2082 **Location:** Southend

Still think the thumb press is the best way

VW-surfbum · **Posts:** 5060

SurferEv wrote:

And using the link provided by VW above and all my parameters for Nic on Front I get.......... 26psi..

Cool

Its quite good that isn't it.

joepud · **Posts:** 198

One thing im always interested in is the sizing difference between tyres currently im running a Kenda Small Block 2.35 up front on my blender. Im tempted to go 2.2 all round on rubber queens or 2.1 nobby nic upfront and racing ralph on the rear. Is it all marketing bull shit or will it actually make a difference if a run difference rubber and sizes up front and at the back?

VW-surfbum · **Posts:** 5060

Not ness in sizes but going from a small block to a rubber queen will be a massive difference!

unityjon · **Posts:** 2082 **Location:** Southend

Back in the good 'ol days BMX racers used to run fats up front and skinny's in the rear for years and years

SurferEv · **Posts:** 924 **Location:** Westcliff-On-Sea

And I usually have the 2.25 Ralph on the back and the 2.25 Nic up front so the front grips well and directs me, letting the rear roll well, but just follow (but I'm on a HardTail anyway)

In the winter I swapped the Nic to the rear and put a 2.0 MudX on the front which seemed ok and changed back when the weather improved a couple of months back.

But yesterday I left the Nic up front and put the MudX on the rear and it was better again. I had grip for direction but the MudX dug down under the mud and gave me plenty of pedaling traction in the gloop. It also sheds the mud so much better.

Simon · **Posts:** 1151 **Location:** Harold Wood

Cheers vw-surfbum think i,m running to much after checking the calculation :thumbup:

VW-surfbum · **Posts:** 5060

It's only a guide but it does give a good starting point

shouldgetoutmore · **Posts:** 500 **Location:** Stanford-le-hope

unityjon wrote:

shouldgetoutmore wrote:

Continental Rubber Queen 2.2 or 2.4 in black chilli compound.

technical reason why ? or just because thats what you have ?

I'm really interested to understand how different tyres make the bike behave differently but itsd an expensive gamble (for me at least) so i may just play it safe and stick with the high rollers as thats what i know and have no issues with, if i change them and the bike rides like crap i'll be devastated, but then i miss the chance of it getting even better ???

i hate this, i'm not a gambler !

Sorry but haven't looked at this topic for a while,
No it's not because it's just what I have, I needed something between my winter Mud x's and summer xdx's for the trip we made to Wales. I wanted grip up front and as little resistance at the rear. And as it turned out the rubber queen race king combo has been fantastic, infact the're perfect. I never wanted for grip at afan and i rolled like a run away train. Also I've done a couple of 50km road rides without much effort.
But there is only one tyre for the gloop and that's the Mud'x. That's why I'd recommend getting a second set of wheels. There's some cracking deals on eBay for around £50 - £80.

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