Search results

...and a very good BioPace story to boot! No offence taken! Your LBS owner is obviously a perceptive cycle engineer, assuming he understood all the technical aspects. I am thinking that perhaps he didn't, or he would have mentioned the orientation issues. My principle concern is that...

...and here is the set-up I use most of the time I'm riding...

...but not the 'out of round' or 'oval' or 'elliptical' chainring story. It began before the BioPace story began, and continues. That's because they work extremely well and are not bullshit at all. It's a great shame that Shimano ruined the market by producing a complete cock-up of the...

Some of you guys should read through this thread http://www.retrobike.co.uk/forum/viewtopic.php?t=47932&highlight=eggrings 'Egg chainrings, who remembers them?' I think, if you understand it, you'll be able to resolve some of the misconceptions that are evident in this thread.

Hey, Lewis, have you given them a try yet? Any conclusions? On the matter of EggRing durability; the larger ring (behind the bash ring) is now over twenty years old, it was first fitted to the Clelandale (see Cleland website: www.Cleland-Cycles.co.uk) in 1989.

Yep... exactly. I like your phrase "assisting you at the wrong part of the pedal stroke" How's that for a useless bit of kit? You've got that bit. You're well on the way to becoming an expert! You now understand more about the subject than the majority of other cyclists.

Well done! Stick at it Cyfa It took me ages to figure out how and why these things work. It will eventually fall into place inside your head, and then you'll be an 'expert'!

Ah, wonderful Wikipedia! I was thinking more on the lines of Eccentricity (Mechanical), rather than (Mathematical). However, we are both right, though you'd win on points. Yes, Chris uses the ratio between the major and minor axis, and presents it as a percentage. As an example, I had...

At the risk of being written-off as a total up-yor-ass pedant: I get what you mean regarding the use of 'eccentricity', but I don't think it would apply anyway; the chainwheel mounting is dead-centre of the ellipse, whereas eccentricity would imply that the mounting is off-centre...

Good luck ~ be sure to get the correct orientation of the ellipse ~ the major axis should be about 90 degees to the crank. Look at the photos in previous posts. Let us know how you get on...

Read the most recent previous posts again. Perhaps printing them out and reading them with a nice cup of tea can help when trying to get your head around an unfamiliar technical topic. That's what I do, anyway. If you still haven't got it, you may like to phone me up and I'll go through it...

Now I'm going to get really pedantic: If you look at the Osymetric website http://www.osymetric.com/index.php?option=com_frontpage&Itemid=40 there you'll see genuine OVAL chainrings. Oval means two semi-circles separated by a rectangle. Think about a speedway track. This is not to be...

I believe that the practical purpose of the high cadence technique is to reduce the effects of the dead spot by whizzing through it. However, my experience has been that, once the difference between the power stroke and dead spot has been ironed-out to some extent, there is much less need to...

In this thread, it is really important that you read carefully the posts that have gone before. Not all oval (or, more correctly, elliptical) chainrings are the same; they're not even similar. Biopace and Eggrings are opposite in their effects. Therefore, because Biopace was completely wrong...

Oh, and by the way, here is the link to the other thread which features a restored (or being restored) Cleland Aventura which has a swing-cam Sturmey rear hub. This is it, go visit http://www.retrobike.co.uk/forum/viewtopic.php?t=46418

Looks like you're the only one reading this just now... The problem with the spoke flanges on the 'Leleu' front hubs being too close together caused this to happen!

I also realise that the video is on a different thread, so I brought it onto this one http://www.vimeo.com/2679372 There are big rocks under that water, that's why I wobble about so much! And I get my bus pass this year!

I saw Frank at some cycling event (it may have been BikeRite at Wooler) but didn't get to speak with him. Have you tried googling? There's one of those floating-cam brake hubs in a photo on the thread titled '1983 Cleland Aventura' and it's in 'Readers Bikes pre 90' (or something like that)...

The Brits never did use hub brakes on bicycles ~ they turned-up very rarely, but we never embraced the idea as did (and still do) the dutch. In the early days of mountain-biking the vast majority were against the concept of hub braking, so much so that one of Jo's 'Mint Sauce' cartoons showed a...

These riser bars, and the ones fitted to Cleland Aventuras are PRE-RETRO!