Showing posts with label mountain. Show all posts
Showing posts with label mountain. Show all posts

Tuesday, February 22, 2011

let the good times roll

It is always good to get out on a bike, the feeling of freedom, speed and the pure adrenaline rush of turning the cranks are always a tonic. It is even better when you are riding the bike you have constructed from the frame up. Slightly different perhaps to riding a new bike, because generally you are certain that everything is set up correctly and all you are trying to do is determine how fast it stops and how tightly you can make the turns. So perhaps it is a good thing that I rode to our local park with the kids and so stopped myself pulling any crazy tricks before I was sure of my mechanical skills. A great leveller of ability, is when you have to stop to support and encourage your 4 year old on their bike.

So what did I find out about the mechanical soundness of the bike? Well, I need to make a small adjustment to the brake and gear lever as they aren't optimal, and I haven't quite aligned the limit screw to allow a jump on to the final cog. Apart from that everything else held together fine. The wheels go muddy, I wall rolled a few steep banks and popped a few (brief) wheelies. By the end of the trip nothing was squeaking or falling off, which is a positive. I washed the wheels off, not because they were muddy, but because of the risk that some of the brown stuff came out of dogs' bottoms, and the paint stayed on. All in all a good start to a career as an amateur bike mechanic and assembler.

Next steps, well I think after the small adjustments to be done it is time to get out on some tame trails near me, and then move out to the bigger challenges after that. I also think that now might be the time to reflect on what I have learned through this process, so I suspect the next few blog posts will carry the dos and don'tsl  in bike construction.

Tuesday, September 14, 2010

Cassettes and remasters

It has been a while since I have had a chance to do any work on the project bike and I have begun to get itchy to get on with it. Sadly, my youngest is now at school full time and the list of jobs that need doing round the house have got measurably longer. I often joke to the wife that since we have reversed roles it is her who is supposed to approach the DIY etc, but sadly she insists on baking cakes so what can a man do? It is true that the way to a man's heart is through his stomach.  This then is the reason that I am back on the bikes.


So today have completed my allotted set of chores and kept house, I find I have half an hour spare. Time in which to change the cassette on the rear wheel. This consists of unlocking a nut on the rear wheel and swapping over all the parts without dropping any of them. The theory is that providing the cassette (that's the selection of gears at the back of the bike) and the freewheel (which connects them to the rear hub) are compatible it is a simple replacement job.


I start first with the removing the tyre on the wheel, not because it is necessary, but because I wish to check how true or straight the wheel runs on the axle. The wheels have been sold as no visible wobble, but it is probably best to check now and tweak the wheel into shape rather than find out when it is on the bike. While I am doing this I read the wheel size on the tyre 26x2.4 hmmm that could be problematic finding replacements. Note to self when buying secondhand rims check the tyre dimensions.  It also starts to try and rain, I pray it will hold off long enough for me to finish the job outside.


The lockring on the original 8 cogs is a little stiff but the with a little shimmy it opens easily enough and allows me to slide the original cassette of the freewheel. I put this in a bag for later. Maybe I can use them or sell them, either way they will need a clean. Which is what I set about doing to the freewheel. It is not particularly dirty, unlike the rime which is shedding black stuff all over me and the light coloured T-shirt I am wearing. However, I think that if I am building from the ground up it is best if the whole thing is as clean and dirt free as possible. Some degreaser and a good scrub and all is clean. Now to add the new cassette.


The cassette is a SRAM PG970 9 speed, and it glows with a satin finish at me from within its packet. A packet that turns out to be all but impenetrable. Not wanting to score the metalwork with a knifeblade I battle the finally wrap until it begins to give up its precious cargo. At last, eyes shining, I remove the cassette unbroken, until near the end I find a wad of plastic bag inserted in the middle. Removing this proves to be the straw that breaks the camel's back and the last two cogs come loose with the lockring. Oh well not a disaster.  I take the bulk of the cassette and start to fit it to the freewheel. It takes a couple of minutes to realise and locate the alignment spline which is smaller than the others. More a process of elimination here as I go round the set trying each one until it slides smoothly in. Now for the last two cogs, and here is where it really gets messy, because now they are separated from the rest, I really don't know which side is wheel side and which isn't. It takes a few moments of staring at how it will work for me to finally put it all together. Lockring on and tightened with the splined tool and the hole process is finished.


So there is another blind myth explored - if you create a sensible design with a finite series of combinations then the pathways are forced to accept one design over another. Oh and it starts raining after I have put the tools away. Time for the school run.

Thursday, August 12, 2010

Specialized P3 2000/2001 specifications


Courtesy of bikepedia here is a list of what was on the frame when it was bought for £1,200 ish pounds

Bicycle TypeMountain bike, front suspension
Sugg Retail$1,399.00
WeightUnspecified
SizesLarge, medium, small
ColorsBlack

Frame & Fork
Frame ConstructionTIG-welded
Frame Tubing MaterialSpecialized A1 aluminum
Fork Brand & ModelMarzocchi Bomber Z-5, 4.0" travel
Fork MaterialAluminum/magnesium, triple-clamp crown
Rear ShockNot applicable

Components
Component GroupMountain Mix
BrakesetProMax linear-pull brakes, Avid AD3 Levers levers
Shift LeversShimano Deore LX RapidFire SL
Front DerailleurChain retention device
Rear DerailleurShimano Deore XT SGS
CranksetTruVativ Hussefelt, 38 teeth
PedalsSpecialized aluminum platform
Bottom BracketTruVativ BB-01
BB Shell WidthUnspecified
Rear Cogs9-speed, 11 - 32 teeth
ChainShimano, 1/2 x 3/32"
SeatpostSpecialized aluminum, 30.9mm diameter
SaddleSpecialized P.3
HandlebarSpecialized Special Rise
Handlebar ExtensionsNot included
Handlebar StemSpecialized P.3 riser
Headset1 1/8" threadless Tange Seiki

Wheels
HubsSpecialized STOUT
RimsAlex Supra-E, 36-hole
Tires26 x 2.30" Specialized Roller Comp
Spoke BrandSpecialized stainless steel, 15g straight gauge
Spoke NipplesBrass nipples

Wednesday, August 11, 2010

first small steps

The frame is far from the mint proclaimed, but then I never expected mint. Who keeps a frame in the garage that long without using it? Expecting to have only minor touch up on the paintwork, I'm a little disappointed to find some relatively large tool marks from where they frame has been stripped. A minor bit of epoxy filler work is all that is required, but the more I look at it the more the frame seems to require than the simple touch up paint routine. My heart sinks - its a respray job. I haven't done one of those since I was given my grandfather's fixie to do up when I was 13. There are several nightmare moments that await a respray - 1. you are only going to chip the paint again. 2. the pro companies use kilns to harden the paint 3. a spray gun is better than any other method. So no kiln and no spray gun and bearing mind issue number one I go for the overcoat method. Here the aim is to prep the surface to hold paint - apply a primer and then several coats of car paint.

Set up with some old dust sheets in the very small shed at the end of the garden I set to work with primer. Wow, I'm not bad at this, the old skills haven't completely gone. Nice even coat with no show through. Damn I've left a sticker on the frame!! Bugger it, I'll leave it as this a cover up not a vanity job.

Matt black goes on well and I have managed to find a sign printer who runs of decals, so I can brand the bike for those who care about such things. It seems that finally I am ready to start the swap from one bike to the next. All I need to do is start sourcing components required to upgrade the bike.


What am I doing???

There are plenty of things I have thrown myself at without realising what it is I am about to do. Facing the mountain never gets less intimidating even with increasing years. So it is again that I set myself against a new challenge. Bike building. Quite why I should be doing this is a lesson in a renewed love of cycling, economics, and the need for some hardware. Now I have to say my natural forte tends to be in the more theoretical aspects of life, but even so I do tend to manage to bodge and muddle through most tasks because I have at least thought the process through. So it is with the logic being:- I have a cheap mountain bike (given to me free), I have been out riding single track a lot, I am now entering the zone where the flexibility in the frame and some of the components are not going to be so tolerant of where I am trying to be on the hillside, (that is to say not down the slope in the trees). I enter the fierce arena that is ebay and come out with a Specialized P3 from around 2000/2001. My plan was to make a straight swap of components from the old bike to the new and then upgrade at leisure. I could never has been so wrong!