Jem
Viscount
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Posts: 3,390
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600ex
May 15, 2016 13:44:38 GMT
Post by Jem on May 15, 2016 13:44:38 GMT
Since I bought this , all I have done is change the freewheel that was 7 cogs, each just seemingly 1 tooth bigger than the last and the biggest being about 18, great for a racer, but ridiculous for me. And I bought a pair of Shwalbe amber walls (not yet fitted). And fitted saddle and chain. I have a few things planned for it and not sure when I will find the time though. So, I just couldn't wait to ride it, I had to have a quick spin this afternoon. Verdict = great bike! Light and nippy. Quick question - I had the chain do a strange flicking back and forth between 3rd and 4th on the back while on the smaller chainring up front, when up a slight uphill. Don't think I have had this phenomena before.(it was back and forth on it's own for a few seconds after a gear change) Any ideas what it might be? Untitled by Sooper 8, on Flickr
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600ex
May 15, 2016 14:35:55 GMT
Post by triitout on May 15, 2016 14:35:55 GMT
Great looking bike! Can't help you on the technical end, but I'm sure someone will have the answer. All your bike needs is a touch of blue to resemble my "Kiwi" green single speed conversion. Green for the grass, yellow for the sun and blue for the sky....a very earthy color combo!
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600ex
May 15, 2016 15:56:07 GMT
Post by cusqueno on May 15, 2016 15:56:07 GMT
We've got enough 600ex to have our own rally.
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600ex
May 15, 2016 20:54:40 GMT
Post by siegeworks on May 15, 2016 20:54:40 GMT
I'd guess the gear slip could be down to low spring tension on the derailleur or wear on the cassette. Usually I find overhauling the derailleur sorts out the problem, a build up of crud has caused many of mine to need a strip down. If it's cassette its usually a more consistent problem so I'd be surprised if it was that. Sounds odd though. I usually experience chain slip rather than the gears jumping. What make are the chain and cassette? Could there be a very slight incompatibility?
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robt
Viscount
Posts: 559
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600ex
May 17, 2016 21:48:28 GMT
Post by robt on May 17, 2016 21:48:28 GMT
If a bit of good home fettling doesn't work, you might try to borrow a derailleur hanger alignment tool to check that the mech hanger hasn't been knocked slightly out of true. I needed to do this once to sort out a friend's wonky gear changing.
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600ex
May 17, 2016 23:56:45 GMT
Post by oldroadietehachapi on May 17, 2016 23:56:45 GMT
Quick question - I had the chain do a strange flicking back and forth between 3rd and 4th on the back while on the smaller chainring up front, when up a slight uphill. Don't think I have had this phenomena before.(it was back and forth on it's own for a few seconds after a gear change) Any ideas what it might be? Since it is a friction shifter and not indexed, I assume you cannot simply trim it out. Sometimes such problems only occur while riding and cannot be duplicated on the workstand. Common causes; worn bushings in the derailleur pulleys, Bent derailleur hanger, bent derailleur cage, worn derailleur pulleys, worn chain, magic (my favorite). Start with the cheapest fix (like swapping parts with another bike). I have one that makes a faint click, yet runs smooth under the same conditions; I have yet to chase it down (pulleys are next) and usually just shift to the next gear. Good Luck Jim
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Jem
Viscount
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Posts: 3,390
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600ex
May 18, 2016 4:54:30 GMT
Post by Jem on May 18, 2016 4:54:30 GMT
Quick question - I had the chain do a strange flicking back and forth between 3rd and 4th on the back while on the smaller chainring up front, when up a slight uphill. Don't think I have had this phenomena before.(it was back and forth on it's own for a few seconds after a gear change) Any ideas what it might be? Since it is a friction shifter and not indexed, I assume you cannot simply trim it out. Sometimes such problems only occur while riding and cannot be duplicated on the workstand. Common causes; worn bushings in the derailleur pulleys, Bent derailleur hanger, bent derailleur cage, worn derailleur pulleys, worn chain, magic (my favorite). Start with the cheapest fix (like swapping parts with another bike). I have one that makes a faint click, yet runs smooth under the same conditions; I have yet to chase it down (pulleys are next) and usually just shift to the next gear. Good Luck Jim Many thanks Jim - I too imagine this wouldn't be replicated on a bike stand. And it only happened once on a 20 min ride. It is a 600RD that I have had in a box for a while , and can't even remember if I have run it on one of my bikes. So, I will just start with swapping that over to test. I only really put it on to get the bike moving. I am after the Arabesque 600 to compliment it's other components , so ultimately it this 600 won't be on there long term.
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600ex
May 18, 2016 6:59:54 GMT
Post by velocipete on May 18, 2016 6:59:54 GMT
Try adjusting the "B" screw on the rear mech,the top jockey wheel may just need a bit more clearance to push the chain firmly onto the larger sprocket. Especially when on the small chainring. Looking good. Cheers, Pete.
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600ex
May 18, 2016 11:09:25 GMT
Post by cusqueno on May 18, 2016 11:09:25 GMT
Try adjusting the "B" screw on the rear mech,the top jockey wheel may just need a bit more clearance to push the chain firmly onto the larger sprocket. Especially when on the small chainring. Looking good. Cheers, Pete. Pete's reasoning is sound, but the 600 RD has a sprung pivot and no 'B' screw. It is worth checking that the little washer thingy with bent up tabs on the mounting bolt isn't out of shape. It is meant to ensure that the mech stays in the right range of positions and that there is tension to pull it back. In my experience it is not a strong point of the design. Also, what is the size of the smaller chain ring? On my VA 600EX, when I moved from 42T to 38T I found that the cage on the 600EX mech was allowing the bottom bit of the chain to ride over the cage. I cured this by fitting a long cage derailleur, but shortening the chain (another suggestion) might have had the same effect. According to Disraeli Gears/ Sutherlands, the 600 short cage RD can shift 28T in total, the long cage (GS) version, 34T. If you are exceeding these by an appreciable amount with your wider range cogs, set-up might be a bit more difficult.
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