Archive for the ‘Tech’ Category

Norco full suspension bikes have featured adjustable travel for quite some time. In fact, VPS stands for Variable Point Suspension, referring to the adjustable travel. The travel is adjusted by moving the shock position between points A and B. For all 2010 Norco bikes with adjustable travel Point A is the long travel position and Point B is the short travel position. In the 2010 lineup there are several bike that offer this adjustability such as the LT series, Fluid series, Faze 2 and 3 and the Phena. Each of these bikes has two travel options as listed below.

LT 6.1, 6.2, 6.3 – 137mm – 158mm

Fluid SE, 1, 2, 3 – 116mm – 143mm

Faze 2, 3 – 100mm-120mm

Phena – 116mm – 143mm

When adjusting travel between settings on many bikes there are adverse affects that can reduce ride quality or decrease performance. Not on a Norco though… when you change the travel on any of these mentioned bikes the head angle, and BB height remain constant. The only difference is the change in travel and a more or less progressive shock stroke. I.E. The long travel mode has a lower leverage ratio and more progressive stroke. The result – short travel is a linear, more XC type ride while long travel is a more active, agressive setup.

Thanks to Steve Bown for asking to learn more on the matter

Dustan

It doesn’t happen often but every once in a while I will admit I get caught on the trail without a tube. Not because I didn’t have one, but because I either gave it away or flatted more than once on a ride. I am slightly ashamed to have admitted this but yes, it does happen. This past weekend I went out riding in Port Moody BC with a friend and it happened to be one of those rides. After Eric flatted once, I followed suit. That was no biggie as we both had a tube, but then Eric tried for round two. Three flats, two tubes, 0 patches.

As Eric got ready to start hiking I made a suggestion, one that I am not sure a lot of people have utilized. Tie a knot in the tube and ride out. That is right, this trick is super simple and low tech but can be the difference between a long hike and finishing a great ride.

To fix this flat, you will need to start by finding the hole. Once you do, tie a knot with the hole at the end which is tucked through the knot loop. Pull the knot nice and tight to be sure that it won’t come undone once inflated.

You will see that the tube is significantly smaller in diameter now that it has been tied. You will need to insert the valve, then stretch the tube around the rim before attempting to seat the tire.

Once you get the tube around the rim you can start to work the tire onto the rim. You should be careful that the last bit you are trying to seat is not at the knot as this area has significantly more bulk around it and could be difficult to work with.

Now that the tire is on, you can re-inflate.I wouldn’t suggest inflating to more than 40psi as the tube is significantly stretched and fatigued. This is not a long term fix but should be enough to get you home. Once you start riding you will likely feel the knot as a bump in your tire. It may be a little rough but it sure beats walking.

If you have your doubts, give it a try.

Dustan

There are a lot of standards when it comes to bikes and the number seems to get significantly larger every year. Just look at Bottom Brackets over the past decade or so. We have Spanish BB, Euro BB and Mid BB, we have widths of 68mm, 73mm and 83mm. Mounting standards like Square taper, isis, octalink, Hollowtech II, Howitzer, GXP, and now BB30… I probably missed a couple as well.

Each and every one of these standards serves a purpose. They were each developed with the purpose of making the bike, lighter, stronger, faster or smoother. Over time this has meant that some have stuck, others have failed and we will likely see more coming soon.

This is not isolated to Bottom brackets either though. We have numerous standards for hubs, headsets, bars, stems, posts and more. I will do my best in this series of articles to clear up the most confusing of these.

Over the next couple of weeks I will be discussing the most common Mountain Bike Standards:

Hub Standards

• 135 x 10mm rear hubs
• 135 x 12mm rear hubs
• 142 x 12mm Syntace Rear Hubs
• 150 x 12mm rear hubs
• 9mm front hubs
• 15mm front hubs
• 20mm front hubs

Headset Standards

• 1 1/8″ Headsets
• 1 1/2″ Headsets
• 1 1/8-1 1/2 Tapered Headsets
• Integrated Headsets
• Semi-Integrated Headsets
• Standard Headset

Bottom Bracket Standards

• 68mm
• 73mm
• 83mm
• Octalink
• Isis
• GXP
• Hollowtech II
• BB30

WOW, that is a REALLY LONG list…..

Check back soon for the first installment.

Dustan

A loose headset is one of the easiest repairs that can be done to a bicycle. The only thing easier, is screwing it up.

The first step to tightening your headset is loosening the stem. This is done usually with either a 4mm or 5mm allen key. Loosen off the stem bolts until the handlebars will move relative to the front wheel.

The second step is the beginning of determining why the headset is loose. The tightening process may be as simple as tightening a bolt, but it could also be a little more complicated. What you will need to do is take a 5mm allen key and remove the top cap of the headset. This is the vertically positioned bolt on top of the stem.

Once this bolt is removed there should be a minimum of 2mm and a maximum of 5mm between the top of the stem and the steertube. The stem should extend higher than the steertube of which it attaches to. If the steertube extends beyond the top of the stem you will need to install an additional spacer above or below the stem.

Correct Headset Spacing

Incorrect Headset Spacing

Once the spacing has been corrected or confirmed, you may start tightening the headset. The next step is to tighten the topcap to the desired tension. Tightening the topcap is preloading the headset bearings and needs to be completed while the stem is loose. As you tighten this top bolt, you will find that the steering will eventually tighten up and bind. There is a happy medium between a knocking in the front end and this binding stage that needs to be achieved. If there is play in the headset moving back and forth, continue to tighten. If the steering is tight and does not move smoothly, loosen.

The last step of tightening a headset is to tighten the stem. Before doing so you must align the cockpit with the front wheels. The easiest way to do this is to straddle the bike and line up the stem with the front wheel. When this is aligned you can move on to tighten the stem bolts. Be sure to notice the torque rating for the stem as over-tightening could cause damage.

Voila, you just fixed it!

Dustan

The bicycle chain is a staple and  a standard for the bicycle. It has been nearly commoditised with its genericy and now, could it become obsolete? Don’t get me wrong there is something to be said about a quality chain but really, it is pretty boring. Isn’t there another choice?

The chain has evolved over the past few decades, it has become, stronger, lighter, narrower and longer lasting but really there has not been a major technological breakthrough since the early 80s.  Comparing something like suspension technology to that of the chain is like comparing a Large Hadron Collider with cavemen using tools… both had their 15 minutes of fame but one is slightly more impressive than the other.

I have recently been given the opportunity to try out a 2010 Norco Judan which is using the Gates Carbon Drive system. The idea of a 29er singlespeed bike using a belt is to say the least – a little bit of a foreign concept. I thru in the towel on hardtails the better part of a decade ago and thought I would never go back. Well, I am, and I am kind of excited about it. The idea of a singlespeed 29er entices me. It will be fast, it will be quiet, and it should be pretty much maintenance free – after all there isn’t really anything to go wrong.

I am a couple of rides into my testing so far and I must say, I am starting to like it. At first I was a little bit detered by the gear ratio. Some of those hills were a little intense for my liking and I was tempted to walk up a couple of steep bits. But, I pushed through and had a blast on the descents. The big wheels can seemingly roll over anything, the frame has the comfort of steel and the belt has been flawless. Only time will tell though if this is the new flavour for 2010. The belt is the first viable option to a traditional chain. There are a few limitations but only time will tell how far it will go.

More Updates Soon… What do you think of the belt? Good Idea? Bad Idea?

Dustan