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That Sliding Doors moment...

(12 posts)
  • Started 9 years ago by Mandopicker101
  • Latest reply from wingpig

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  1. Mandopicker101
    Member

    A tale of mechanical woe...

    As approaching the lights outside Leith's cop shop I'm changing down a gear. Suddenly there's a hideous 'Crunch-CRUNCH-GRIND' noise from the rear of the bike. Bike stops on a sixpence. Mandopicker narrowly avoids toppling into traffic.

    Heart-rate back in a safe zone, I'm inspecting the damage. Gear hanger totally sheared off, flinging mech and chain into rear wheel causing untold damage. I'm no mechanical expert, but bicycle chains aren't supposed to do the twist are they? Rear mechs and spokes don't normally interact.

    Oh. Had I not been outside the cop shop, this might've been my Basil Fawlty moment, giving my unhelpful bike a good thrashing. Instead I contented myself with a muttered oath and a deep sigh.

    Shouldering arms, I trudge along towards my office before thinking maybe I could free the mech wreckage and at least wheel the bike along the street. OK, chain doesn't look quite so bad now.

    Complicating matters, I had to be back at school for a lunchtime pick-up. So a functional bike is almost the only option - public transport doesn't go when I need it to and a taxi would be likely to be snarled up in Seafield traffic. Plus it leaves my wrecked bike at the office and I still need to get it fixed.

    Trudging into Pedal Forth, I wibbled about what had happened and glumly noted the guy's not-exactly-hopeful expression (what was I hoping for - 'Ach that's nothing, gimme five minutes'). Rear mech and gear hanger are toast. Front mech might be in intensive care. Chain is...pretty twisted. Rear wheel has unknown damage.

    Upshot was I got my bike back at 11:55am, leaving just enough time to race (gingerly) home. My initial burst of enthusiasm was quickly spiked my a litany of problems...

    Chain had been Frankenstein-ed back into life with a few wrecked links removed and a master link inserted. New basic (MTB) mech fitted to get it on the road. Rear wheel broadly trued. Front mech adjusted but it's dying anyway.

    By now my bank card's turning slowly to lead. Oh.

    'Aye, but that's not all'...

    ...inner chain ring is at end of life. Rear wheel isn't exactly true. Rear cassette is almost toast. Front wheel isn't true either but at least it rolls. Some vague unhappiness about the performance of my left shifter.

    Glimmers of hope?

    Not many, but I *almost* put my nice wheels on the bike this morning, but a p*ncture meant I swapped back to the beater commuting wheelset (which has the older cassette on). Nice wheels have a relatively new cassette. I have a shiny 105 mech sat in the shed (and how I wept for it...) and a brand new KMC chain waiting to be fitted.

    Many many pounds Sterling lighter, but at least on a functioning bike, I reflected that it could've been worse. I could've been in the middle of nowhere when this happened, as opposed to a mile or so from a LBS with a couple of good mechanics. Or my good wheels could now be a tangle of spokes and rims.

    Zipping back to school, I imagined a scene this morning where I'd dropped my keys by the bike's rear wheel. Bending to pick them up, I notice some small but obvious sign of the impending doom and nipped into my LBS to have a mech hanger fitted for a few quid. Camera cuts to Mandopicker who laughs with the mechanic 'Wow, thanks for that. Man that was close - I'd hate to think what might've happened if I hadn't noticed...'

    At least Ribble have Stronglight chain rings going cheap right now...

    Posted 9 years ago #
  2. DaveC
    Member

    Sorry to hear of your wows. If there is anything 'we' can give you to help with repairs, just pipe up. I have a couple of spare Tiagra front mechs surplus. Perhaps someone has a spare rear? I can true wheels if you know the length of spokes.

    Posted 9 years ago #
  3. cb
    Member

    "bicycle chains aren't supposed to do the twist are they?"

    I have seen a bicycle (probably some form of recumbent, although I don't really remember) with the drive train attached to the front wheel which relied on the chain twisting to some degree to allow the front wheel to steer.

    Once on my old mountain bike which was running with an exceptionally well worn drive chain, the chain managed to get a couple of 180 degree twists in it (not really sure how this happened).

    It was actually possible to pedal it like this (and I did for a short distance before realising what was wrong). The twists seemed happy to stay in the same place, between the front and rear mechs.

    Twisting the chain back into a straight line was easy enough. I'm sure I got a few more months service out of it!

    Posted 9 years ago #
  4. SRD
    Moderator

    @cb sounds like an 8-freight as sometimes piloted by chdot

    Posted 9 years ago #
  5. wingpig
    Member

    Mnegh. Had that happen a few times: once 200m from the office with a relatively clean hangar-snapping which preserved the wheel, once with full mech-snapping hangar-ripping chain-twisting spoke-snapping wheel-buckling, but with only a mile to go to the office (and a bike which was wheelable once I'd spent ten minutes levering the mangled mech and chain from the wheel), then once again at the start of the way home when I managed to catch it in time to prevent it doing any more than permanently loosening the pulley cage plates and crimping all the driveside spokes - that was recoverable to a cycle-gingerly-home state, but still required new bits.

    Posted 9 years ago #
  6. cb
    Member

    @srd, def not an 8-freight (which I think is rear wheel drive and front wheel steer?).
    Probably seen in a museum somewhere, maybe Drumlanrig?

    Posted 9 years ago #
  7. SRD
    Moderator

    ah right. I defer entirely to superior knowledge. my one experience of riding the 8-freight _felt_ like the chain was twisted though....

    Posted 9 years ago #
  8. Mandopicker101
    Member

    Thanks all for your comments. Much appreciated.

    This evening's ride home offered an opportunity to reflect and the bike isn't toast (yet). Reviewing what parts I do have, most of the immediately necessary bits are already to hand. ALthough the front mech is circling the plughole, it isn't gone yet. That said, I might see you Dave C for one of those Tiagra numbers.

    Having watched several How-To videos and read the Haynes Manual about fitting new chains...my chain-breaker duly broke a moment ago. So, tomorrow's club run probably isn't going to happen, but that's OK.

    Posted 9 years ago #
  9. bdellar
    Member

    I once had my chain snap as I was going up round the evil roundabout at the top of Leith Walk/London Road. I came to a stop, with angry traffic all round me. I had to get off and walk off the roundabout. Very scary!

    Posted 9 years ago #
  10. Darkerside
    Member

    Recumbent with front wheel drive: raptobike, as previously ridden by Dave of this parish

    http://mccraw.co.uk/raptobike-midracer-review/

    Posted 9 years ago #
  11. Mandopicker101
    Member

    New mech and chain fitted and, barring some tweakage, all's looking better. A new cassette might be required as the 11-32 may be beyond the capacity of the 105 short cage mech but I'm well within the overall tooth count for the mech. In the biggest sprocket, the mech looks at its limit and while its unusual to ride at extremes, I'd prefer to avoid putting it under undue stress.

    I'm now thinking of replacing the inner chain ring (the original 105 affair it was fitted with).

    I'm running a Stronglight Dural outer ring at the moment. It's been grand and, helpfully, they're on offer at Ribble (£9.95). Does anyone have any experience of how many miles you're likely to get out of these rings, always accepting this is influenced by plenty of variables. Is it worth buying one of the Zircal rings (even harder) or going for a steel inner ring since in my case the inner ring sees a lot more work? I've read about people getting 10k+ miles out of steel rings...

    Posted 9 years ago #
  12. wingpig
    Member

    I replaced one after about 5,000 when it started slipping every time I set off, after having rotated it 72° every couple of months to try and even out the instances of greatest wear. It lasted about as long as some sort of FSA of unknown precise level as it was a present. Currently on another Stronglight, which has done about 3k so far with no sign of excessive wear. All on the middle ring, which I rarely leave.

    Posted 9 years ago #

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