ok my stuff about weight up there was rubbish, I reckon it’s between crests or arches, arches are only another 25g for each wheel over a 717, I’ll probably just go with them

Cheers for the responses everyone, I might give the no tubes a go then. I had thought maybe I could get away with something lighter (eg a crest) but it was mainly just me being conservative, the flows are the same weight (or less) than the 717s and thought through some illogical reasoning that must imply some equivalent strength. Then again maybe I could do with something beefier if I’m not taking a weight penalty over my current setup.

It’s the wheel pro guide i have and I’m fine with my current wheels for the time being, it was going to be a project over Christmas for when I got fed up with crap TV so intend to take my time with it.

Now just got to decide whether I’m going flow, arch or crest I guess. oh and spokes, I run super comps at the moment but maybe if i’m saving all this weight at the rim I should save money and go with comps, they’re a damn sight easier to get hold of!

Thanks! It’s a new set of brakes hence the shortening so I’d hope the lever/reservoir assembly is still ok. I did have a syringe ready to try the reverse method but for some reason I couldn’t get it set up so that there was no air in the tubing attached to the nipple, it always seemed to draw a little back in, even when I forced it out. I didn’t fancy squirting that into the caliper!

Also I was doing this with the brakes off the bike, lever attached to a set of handle bars in a work stand with the caliper dangling so your saying I should have it the other way round? caliper elevated? My rationale was that there were more nooks and crannies for the bubbles to float into if the caliper was the higher.

Intel PRO/Wireless 2200BG with XP Pro.

Its a reasonably old laptop (Dell D410 bought in August '05), I've reformatted it a couple of time now and always just used the latest driver from the Dell website. Although I do recall having issues installing it and getting it to work so maybe thats where I need ot look.

'if you get a Ka or Matiz you are stuffed.'

you can get 4 bikes and 2 people inside a ka mkI I'll have you know! just got to have the car packing skillz. Admitidly I do have a Mondeo estate now

heat flux equation for a heat exchanger:

Q = UA delta T

where:
Q = heat flux
U = overall heat transfer coefficient (we'll assume this is constant for both radiators)
A = surface area (much bigger on your new radiator)

delta T = ((temp water in – temp air)-(temp water out – temp air))
ln((temp water in – temp air in)/(temp water out – temp air))

increasing the surface area will be balanced by an increase in Q and a decrease in the temperature of the water leaving the radiator. given that heat dissapates more quickly in metals than liquids the radiator temperature will be more uniform than the temperature of the working fluid inside. This will lead to an overall lower temperature of the radiator metal.

Sorry I guess all of that is of no real practical use to you if your kitchen is still cold though!

Apparently more people have been killed by coal fired power than nuclear (though even if that FACT is true then is probably isn't on a fair basis)

That's not really a very solid way to go about an argument is it, the graph I linked earlier shows that statistically dams bursting happens more frequently and kills more people than nuclear catastrophes

Strangely nobody seems to say that Nuclear power needs, electrical power to power the pumps and all the lights etc,this comes from, coal, gas and oil fired stations possibly or even hydro that can be switched on a press of button .

for start up and shutdown you need an alternate source and this is how often? They don't flick them on and off each day, I imagine they run constantly for years as any chemical plant would (aside undesired LTI's).

The remainder of the time power can be used from the generation ongoing at the plant

Page 15 of this book shows a quite interesting graph:

http://books.google.co.uk/books?id=49Yb4EfZYwkC&lpg=PP3&ots=TQyoRoCJ_U&dq=process%20safety%20analysis&pg=PA15#v=onepage&q=&f=false

quite an interesting subject too although can seem a bit morbid at points.

I'm all for it by the way. Waste disposal, well it comes from the ground (granted in a less enriched state) why can't it go back in there!

yeah, whilst holding the bare cable under tension:

edit: before anyone mentions, yes I know my thumbs are retarded, both of them are like that

13 months approximately, got them on my '09 kona Jake, they're the Tiagra's with the wee window if that helps

I must also appologise for my appauling apostrophe use in the thread title!

The problem seems to be independent of the mech or cables (unless it's in the first inch from the nipple. I've undone the cable from the mech and pulled back the outer, and holding the cable taut i've tried to shift down, nothing happened.

I did manage to get it to shift one time and pulled the cable out to inspect it, it looked to be in fine condition, no kinks or frays. I popped it back in and tried shifting, it got stuck in the big ring again

Hmmm I've had hassle before with them, I've found a big steel G-Clamp to work sometimes, obviously you have to find something to sit on the G-Clamp clampy bits to push the bearing through and hold the hub body (if that makes sense).

First time I did it it was bloody frustrating and seemed to just be a case of tw*t harder which is horrible as you never know how far you dare take it. Like Onzadog says watch out its not going squint.

Good Luck! (and don't blame me if you do tw*t it too hard!)

New Mondeo has it too

Another Handjob

Is this some sort of graduate engineer baiting thread?

Was going to write this out myself but wikipedia puts it quite succintly:

"Chemical reactions associated with rusting

The rusting of iron is an electrochemical process that begins with the transfer of electrons from iron to oxygen.[3] The rate of corrosion is affected by water and accelerated by electrolytes, as illustrated by the effects of road salt on the corrosion of automobiles. The key reaction is the reduction of oxygen:

O2 + 4 e- + 2 H2O ? 4 OH-

Because it forms hydroxide ions, this process is strongly affected by the presence of acid. Indeed, the corrosion of most metals by oxygen is accelerated at low pH. Providing the electrons for the above reaction is the oxidation of iron that may be described as follows:

Fe ? Fe2+ + 2 e?

The following redox reaction also occurs in the presence of water and is crucial to the formation of rust:

4 Fe2+ + O2 ? 4 Fe3+ + 2 O2?

Additionally, the following multistep acid-base reactions affect the course of rust formation:

Fe2+ + 2 H2O ? Fe(OH)2 + 2 H+
Fe3+ + 3 H2O ? Fe(OH)3 + 3 H+

as do the following dehydration equilibria:

Fe(OH)2 ? FeO + H2O
Fe(OH)3 ? FeO(OH) + H2O
2 FeO(OH) ? Fe2O3 + H2O

From the above equations, it is also seen that the corrosion products are dictated by the availability of water and oxygen. With limited dissolved oxygen, iron(II)-containing materials are favoured, including FeO and black lodestone (Fe3O4). High oxygen concentrations favour ferric materials with the nominal formulae Fe(OH)3-xOx/2. The nature of rust changes with time, reflecting the slow rates of the reactions of solids.

Furthermore, these complex processes are affected by the presence of other ions, such as Ca2+, which both serve as an electrolyte, and thus accelerate rust formation, or combine with the hydroxides and oxides of iron to precipitate a variety of Ca-Fe-O-OH species."

Appologies Bruneep, I didn't read the post properly!

bruneep, does the Academy have a larger catchment than the Primary so the kids will have further to travel?

Back in my day in Aboyne (all of 4 years ago) we'd get around a week off each year (cumulative). It was ace, got to go sledging, boarding etc… didn't do me any harm. Chill out and let your kids enjoy it! It's as if you lot don't like being around your own offspring!

Someone said about what happens if young kids can't get home? Do other schools have parents in the village of the school for adverse conditions?

Cheers for all the replys so far guys, I'm going to look into it, doubt I'll have any free time for the rest of this winter (midway through my MSc) but I'd like to be ready for next winter!

Ooooh and what if your feeling run down, do people operate a 'not fit enough to ride not fit enough to work policy'. I sometimes feel that riding in crap weather will guarantee the onset of a cold (when already feeling run down)

'can understand if you lived 30 miles away or something and those 30 miles dont go near a station…… but to sit for an hour to move 3 miles cant be productive to your free time !'

Is this a don't call Mat a lazy bastard clause Terry?

I go in for 7.15 and leave at 16.30 before the Aberdeen traffic gets bad anyway

Zulu-Eleven, personally I reckon Algae's digesting CO2 then processed to make Biofuels is the most promising way forward at the moment as it sticks to our current infrastructure, much denser energy/area/year compared to other biofuels too.

'>it's not going to change (as long as we are getting H2 from water).

Your words not mine'

Sorry I'm not sure what your getting at? my point was that the energy of formation of elements is something that cannot be changed. Yes I know that with fusion the power output is greater than this initial energy requirement but the initial energy requirement is not going to changed. Unless you mean that we're going to get H2 somewhere else, I guess we could suck it out of the sun with a big straw, I don't know I'd like to be enlightened!

H2 is not a fuel source, it is just a medium. It's most abundent form on earth is in H2O, removing the H2 from O is a reversal of the combustion reaction (or whatever is done in the fuel cell) and therefore takes the same amount of energy.

This means your still left with the requirement of an energy source to seperate H2 from O. Saying producing hydrogen currently takes a lot of energy is like saying bikes currently will not freewheel uphill, it's not going to change (as long as we are getting H2 from water).

Doesn't really answer the original question but I'd maybe guess electrical is more efficient than combustion despite there being more stages involved. H2 wouldn't be used for power plants (ignoring fusion) because you would be using electricity in the first place to extract it, it's more that H2 is a convenient medium for transporting energy, think of it like a battery. It's better than a battery because it doesnt require heavy and rare Lithium and it doesnt lose performance in the same way that a battery does

they don't have a track yet afaik, are you thinking of the lecht?

http://www.lecht.co.uk/

tbc:

'the bike mechanic'?

will James come out in a rash if he is mentioned by name on stw?

Are you not Iain from the distillery?

I'm the kid from Aboyne with the orange handjob

Didn't know you were on stw Hal! so your back riding now?

'You'll love the riding around here within say 30 miles.. '

Reel that in a bit to 25 miles and stop riding my trails Aberdeen folk! :p

Ok, so the 28" Tubus racks are fine clearance wise with a 29" wheel and 2.1" tyres TJ?

This is a Sand Inbred 29er and has rack mounts no?

(the actual bike I'm putting it on)

hmm it's got an alfine hub I'm afriad so can't get away with the QR attachment, any other suggestions?

I think it needs more Marquees…

is there actually much singletrack close by to be had? Everything seems to just be long epics (not a complaint by any means).

Live in Aboyne so it's a bit far to ride for a loop but then it feels a bit close to drive too for a ride.

Any chance of being shown stuff up there, I just seem to ride the same stuff down here.

You need the lights during the day to show indicators and brakes though no?

Where do you put your bikes and the rest of the biking crap when your sleeping in said estate/van? I have a mondeo estate but think its far easier just to take a tent to races etc

N2 (l) ?

Hmmm very nice! Tried taking lochnagar by bike a few years ago and took the east approach track and ended up carrying pretty much to the top then not being able to descend much on the way down Glas alt shiel (IIRC that’s what the burn to the south is). Think I need to give something along those lines a try this summer