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Post by hodgy on Jul 12, 2016 8:21:00 GMT
So ..the new bike is coming with rims which are a little bit wider than normal ...29mm internal width..650b..tubeless ..
Vigilante & Trail Boss tyres 2.3 & 2.4 ..
I'm currently 196lbs...and I'm carrying with full kit about another 25lbs ( clothes & pack )
Any ideas as to what pressures to run bearing in mind that larger volume tyres and wider rims with a tubeless set up mean that lower than normal tyre pressure can be used ...
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Post by Deleted on Jul 12, 2016 8:45:04 GMT
Purely down to the individual Hodgy, but as a starting place use this (what I run) and then just see how it goes. Get a quality pressure gauge and go down or up a couple of PSI each time - try and have a 'reference trail' too as a good comparator.
So I'm around 14st (haven't weighed myself in ages so just a good guess) running tubeless and I go 28 rear, 25 front (psi).
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Post by Jimbo on Jul 12, 2016 9:25:51 GMT
I'm 72Kg / 11'3 stone, and run 30 rear and 27 ish on the front but I have a lot of road / canal paths on my routes.
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Post by Deleted on Jul 12, 2016 9:36:33 GMT
Seems high Jimbo, considering your waif like weight  Have you tried em lower? |
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Post by Jimbo on Jul 12, 2016 9:42:53 GMT
Seems high Jimbo, considering your waif like weight Have you tried em lower? I do drop them to 25 when I'm at a trail centre but my last 2 rides of 30k each had about 3k of single track and the rest was canal, railway or bridleway so prefer the higher pressures for faster rolling. Was glad of it too the other day as my mate and I hit a hidden drain hole on the edge of the canal, he was on lower pressures and got a pinch flat where as I bumped over  Not forgetting another 2/3kg of camel back |
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Post by hodgy on Jul 12, 2016 10:40:59 GMT
Cheers lads ...( ain't it good when someone still calls you a lad ?!)
Good starting point Pez ...we are of similar weight ..
I read an article a few years back Jim ...which I found a little hard to accept ...that stated the lower the pressure ..the faster you roll.
I'm sure it was Dave T ..who came up with it originally ..I haven't put that to the test being built for comfort not speed ...lol
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Post by Jimbo on Jul 12, 2016 13:56:14 GMT
I can't get my head round that, the lower the pressure I can definitely feel the drag differences.
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Post by Deleted on Jul 12, 2016 17:24:11 GMT
I can't get my head round that, the lower the pressure I can definitely feel the drag differences. If you think outside the box a bit though - imagine being at a standing start - wouldn't you want the most of your tread contacting the ground as possible? to launch you as you put the power down? Just a thought. |
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Post by Marmite on Jul 12, 2016 17:25:49 GMT
Sorry Hodgy are you buying a new bike ?
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Post by Deleted on Jul 12, 2016 17:28:02 GMT
Cheers lads ...( ain't it good when someone still calls you a lad ?!) Good starting point Pez ...we are of similar weight .. I read an article a few years back Jim ...which I found a little hard to accept ...that stated the lower the pressure ..the faster you roll. I'm sure it was Dave T ..who came up with it originally ..I haven't put that to the test being built for comfort not speed ...lol Nice one Neil, like I said, depends what you ride, depends what type of rider - if you favour rolling speed over grip etc etc. It is a good starting point and today I ran those pressures over a very wet Cannock - felt great - not one brown pants moment at all. |
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Post by hodgy on Jul 12, 2016 18:20:34 GMT
Sorry Hodgy are you buying a new bike ? Naaah ...it's just a rumour lol |
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Post by Deleted on Jul 12, 2016 19:05:30 GMT
I have always thought that due to my waif like 16stone I need high pressure in my tyres talking 30 psi rear and 35psi front great for rolling and climbing I thought BUT recently I have tried 30front 28 in the rear and noticed the difference on the downs but also the climbs going up seams easier as I was always spinning out with higher pressure
This Sunday bowers whilst out riding with that there Zulu fella we were chatting about tyres and pressures when I said I seem to be pinging off everything so we lowered the pressure in the front to 26 front and and I think it was 24 rear climbing was a little harder but the downs were loads better even giving me a PB on lower cliff and even better loads more confidence
So I will be fetteling with the pressure around this level to get it filed in just right now and will be sticking with it
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Post by hodgy on Jul 12, 2016 19:31:37 GMT
That's interesting that you would have less pressure in the rear ...with most of both the rider & bike's weight at the back .
Anyone else do this ...?
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Post by beansontoast on Jul 12, 2016 19:35:44 GMT
Around 8-9psi in the rear works well and maybe upto 10psi in the front!
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Post by hodgy on Jul 12, 2016 19:46:48 GMT
Yeah right ..
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Post by Deleted on Jul 12, 2016 20:18:28 GMT
EuroBob wasn't listening to me as usual, we actually went 30 rear and 26 front.
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Post by jack on Jul 12, 2016 20:21:20 GMT
I tend to run
20/25 ish front and 2 3 psi more in the back
Depending on the terrain and what I do
Higher pressure rolls faster on hard smooth terrain
Till a certain point then it's actually slower
The harder it is the more it vibrates and at a certain point the vertical vibrations slow the rotation down
And the same with the lower pressures rolling faster over certain terrain because it moulds to the terrain etc.....
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Post by Rlo80 on Jul 13, 2016 9:46:23 GMT
It all depends on the type of ride and/or weather conditions. But usually 27-30 rear, 24-27 front. That Topeak gauge is great and it's incredible how 1 psi can change things!
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Post by Deleted on Jul 13, 2016 10:29:27 GMT
Pretty much the same as me that.
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Post by notsarkyadam on Jul 22, 2016 18:22:11 GMT
30psi all round im 115kg
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Post by Deleted on Jul 23, 2016 6:05:49 GMT
Recently went as low as 23 front/25 rear. felt exactly the same as 26/28  |
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Post by hodgy on Jul 23, 2016 6:21:48 GMT
As per the original post ...the internal width of the rims are wider than normal... 29mm...and sit part way between normal and fat bike territory with higher volume tyres ....I'm running 18psi front and 20psi rear ...which seem to be working out so far ...but thanks for all the input .
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Post by Rlo80 on Jul 23, 2016 8:26:46 GMT
Recently went as low as 23 front/25 rear. felt exactly the same as 26/28 I don't think you would notice...my only concern is hitting something hard and busting a rim with low pressures! As much as low pressures give you a lot of grip, they can also make it drag a bit of course! I remember on my 29er damaging a rim due to low pressures (and a stupid bunny hop that went very wrong...so I'm mostly to blame of course but if I had a bit more pressure probably it would have been fine) Neil, wait until you see mine...38mm external with 32mm internal! They do look make it look like plus sized tyres! More traction on normal tyres without boost and all the new "standards" |
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Post by Deleted on Jul 23, 2016 12:46:51 GMT
Got to get me some of those sixth element carbon jobbies.
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Post by Deleted on Jul 23, 2016 12:48:00 GMT
No you're right G - anything around 23/26 front 25/28 rear is good for me.
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Have you tried em lower?
