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  1. PurpleFrog

    BSO's

    A huge range of opinions and experiences in the comments on this article: http://www.southcoastbikes.co.uk/Dont-Buy-a-Cheap-Bike The one I found most interesting: ..I think that Halfords might be suffering from cognitive dissonance when it tries to sell bike care plans with BSO's. It's...
  2. PurpleFrog

    Question for people with dropbar mtbs

    Can you pump running dropbars? My guess was that pumping works ok when you're using flared drops alla Phelan ..But that it doesn't really work with flareless road drops - the motion seems wrong with that wrist angle. And that that you'd need drops set up high, so that you're always riding in...
  3. PurpleFrog

    A bigger change than 29: dual chamber suspension?

    I think this picture explains the concept: ...You can have extremely low outer pressure for a huge contact patch and higher inner pressure to avoid pinch flats. Ride reports are extremely promising: http://www.pinkbike.com/news/Schwalbe-D ... -ride.html How this will interact with wheel...
  4. PurpleFrog

    Looking for a *practical* suspension fork for a Zaskar

    I was going to keep my Zaskar all-rigid, but it's behaving so well I'm finding it hard to resist a suspension fork on. But: - I need to stay inside a one bike limit! So the Zaskar needs to stay rideable for commutes. Which means a lockout and a fork that doesn't need too frequent servicing - at...
  5. PurpleFrog

    How much different can frames with the same geometry feel?

    So GT made 900 different models with the same geometry - some from one sort of aluminium, some from another, some from steel made by Zen monks, others from fossilized mammoth bones and a few from a composite material made out of pressed ferns. Kona wasn't quite as willing to experiment, but they...
  6. PurpleFrog

    Facepalm components

    I've been going a bit crazy trying to work out what size middle chainring an old Alivio crankset needed, then crazier trying to work out how the ring was held on... Then I began to have a suspicion, but I didn't dare believe it until I googled... the rings are riveted together so you can only...
  7. PurpleFrog

    Cheap (compared to UK) Schwalbe Almotion "super slicks"

    The Almotion is Schwalbe's new top-of-the-line fast-but-wide tyre, going in above the Marathon Supreme (a long term darling of the CTC set.) It's supposed to keep all the good parts of the Supreme (speed combined with durability, protection and grip) but to be even faster and a somewhat decent...
  8. PurpleFrog

    The extremist fringe

    However dedicated a retrobiker you think you are, this guy has you beat. At least he does if you're not not Jacqui Phelan. For he has been a bike messenger for over 30 years and used the same bike all that time. That's 60,000 hours racked up on one frame by my calculation. Maybe even the same...
  9. PurpleFrog

    The u-brake is b-a-c-k (and it's mad!)

    Shimano have decided that they're the future of road racing: http://velonews.competitor.com/2014/09/ ... ure_343690 They're liked for the great modulation plus the clearance for wider tyres (up to 30mm - that probably would be a Godsend on the cobbles during a Roubaix) that future road...
  10. PurpleFrog

    Planing

    There's more technical stuff here: http://janheine.wordpress.com/2011/10/0 ... stiffness/ http://janheine.wordpress.com/2011/02/2 ... stiffness/ ...Does this make sense to anyone here and have they noticed any frames that seem to give an extra boost to pedaling? I have a suspicion that the GT...
  11. PurpleFrog

    Headset compatibility - replace threaded with threadless?

    That's it, really: can a bike like a Zaskar with a 1 and 1/8" threaded headset take a modern threadless of the same size instead? (I don't want to do this - I've just been reading up on headsets and can't find the answer..)
  12. PurpleFrog

    Boring Selle Italia saddle identification question

    A friend tried out my Mary Barred Zaskar to get a feel for said bars. He's on the fence about the Mary Bars (and hates my DX thumbshifters, so there's something very wrong with him) but wanted to buy the saddle off me because he said it was that comfortable. And I have no intention of selling...
  13. PurpleFrog

    Best quill to ahead adaptor

    They all look the same - BBB, Profile, etc - but are they? I'm having some trouble with the last one I bought (which was neither of those brands.) (I'm looking for something to fit a 1 1/8 headset, but I suppose I could use a shim.)
  14. PurpleFrog

    The TDF, Old Style

    I've never really been interested in road cycling, but......... just "Gosh!" Really. All the following stories are from cyclopunk.blogspot.co.uk Garain became a professional that same year, and did so in typically unusual fashion: having turned up for a race in Avesnes-sur-Helpes, he was...
  15. PurpleFrog

    Most terrifying components

    Look closely at the brake arm on the left. But you don't have to look VERY closely. And this is an advertising, presumably of unused randonly selected brakes...
  16. PurpleFrog

    1957 Mountain Biking Video (from New Zealand)

    http://www.youtube.com/watch?v=VfcIS2GBAig&feature=player_embedded
  17. PurpleFrog

    Zaskar Identification Algorithm

    This is my attempt at a complete True Zaskar Identification Algorithm. For now "True Zaskar" = American Zaskar, because Taiwanese Zaskars used different tubing. I was motivated to create this because all the rules I found while googling were incomplete, and - much more importantly - I'm stuck in...
  18. PurpleFrog

    The Oldest Zaskar In The World

    Hans Reye's team first team Zaskar: Zan - I mean "can" - someone explain the problem with welding???
  19. PurpleFrog

    Slick tyres: an amazingly complicated subject

    If you use highschool physics to analyse the performance of slicks on the road, you'd expect narrow slicks to grip as well as wide ones. E.g http://www.stevemunden.com/friction.html But they don't, because the physics of really pneumatic tyres is bloody complicated... I.e. if you imagine a...
  20. PurpleFrog

    It's a 700c Zaskar

    It looks completely at home with the different wheel size too:
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