http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Tag: skipping chain - Recent Posts en Wed, 13 May 2026 03:01:59 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-360053 Thu, 28 Apr 2022 08:08:44 +0000 chdot 360053@http://citycyclingedinburgh.info/bbpress/ <p>Thanks for update </p> <p>Pump problem unusual! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-360052 Thu, 28 Apr 2022 06:43:10 +0000 531 360052@http://citycyclingedinburgh.info/bbpress/ <p>I realise this thread is not the subject of burning interest, but for completeness the two problems have been resolved by slow processes of elimination and trial. First the chainring on the steel bike *was* badly worn. The teeth on the small ring had become pointy not rounded on top. It was a TA Zephyr ring. I am trying another brand this time as it was not that old. The clicking on the carbon bike turned out to be a pump mounted beneath the water bottle with head just resting against the frame; on every downstroke the slight flex was enough to cause the pump to hit the frame and make a noise. Thanks for suggestions! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359305 Fri, 01 Apr 2022 09:01:37 +0000 chdot 359305@http://citycyclingedinburgh.info/bbpress/ <p>“chainrings not worn”</p> <p>All things relative of course, but certainly chainrings usually need to be VERY worn to slip.</p> <p>Assuming they are removable, it <em>might</em> be worth turning it/them round. </p> <p>“and the chain is new”</p> <p>Again, normally, it’s rear cogs that are likely to slip after fitting a new chain.</p> <p>All very odd…</p> <p>“where's the best bike mechanic“</p> <p>That’s a bit of a double question - both individual mechanic and shop with most experience/appreciation of ‘classic’ bikes.</p> <p>General ‘wisdom’ here is that ‘reliable’ repair shops are/include Eastside, Bicycle Works, Cycle Service.</p> <p>They all major on repairs (Eastside also sells secondhand bikes). </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359300 Fri, 01 Apr 2022 00:57:36 +0000 531 359300@http://citycyclingedinburgh.info/bbpress/ <p>chainrings not worn, and the chain is new. I know what the likely solutions are by this point which makes this all the more frustrating. </p> <p>I'm using an 8 speed chain (connex) on a new 7 speed freewheel. This combo (with a different brand of chain) has worked for me for 5 years. But the skipping was there also with the previous (kmc) 8-speed chain (which is why I swapped it).</p> <p>I've not had my bike to a bike shop since 1983 or so, but I might need to bite the bullet. So where's the best bike mechanic for a retro build like this? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359290 Thu, 31 Mar 2022 20:48:37 +0000 chdot 359290@http://citycyclingedinburgh.info/bbpress/ <p>“I might try out that single speed suggestion. If it works maybe I'll just bin the derailleur...“</p> <p>Well, but</p> <p>Likely to work fine as a ‘singlespeed’, but wouldn’t mean the mech was the problem. </p> <p>Still more likely to be worn chainring and/or very worn chain. </p> <p>See photo at 2.</p> <p><a href="https://www.parktool.com/blog/repair-help/when-to-replace-a-chain-on-a-bicycle" rel="nofollow">https://www.parktool.com/blog/repair-help/when-to-replace-a-chain-on-a-bicycle</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359289 Thu, 31 Mar 2022 20:03:50 +0000 531 359289@http://citycyclingedinburgh.info/bbpress/ <p>I really appreciate this suggestion which I have not done yet. I did try two other things:<br /> (1) I took out a link in the chain. I thought it had OK tension. However because I am running a 26 I am at the limit of the Nuovo Record derailleur capacity (these were built for when legs were legs) I had a slightly longer chain than might be ideal to be able to just handle the big-big end of things. So I took one out. Unfortunately that did not help the skipping but I have a feeling it will make shifts snappier. Just have remember to not use big-big.<br /> (2) I replaced the old record jockey wheels with new ones off of ebay. These were only £4 so not a huge investment. I noticed that the old ones were much more pointy than the new ones. They seem to fit fine. I think they do make things feel a bit better but unfortunately I still have the skipping when I jump on the pedals from a standing start.<br /> On the w/e I might try out that single speed suggestion. If it works maybe I'll just bin the derailleur... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359226 Tue, 29 Mar 2022 12:35:05 +0000 Dave 359226@http://citycyclingedinburgh.info/bbpress/ <p>As a diagnostic for the skipping chain, you could temporarily fit the chain as a singlespeed directly around one chainring, one cog. If it still misbehaves that rules out the derailleur. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359214 Mon, 28 Mar 2022 22:07:22 +0000 chdot 359214@http://citycyclingedinburgh.info/bbpress/ <p><a href="https://m.youtube.com/watch?v=hKDi6ym3Ny0" rel="nofollow">https://m.youtube.com/watch?v=hKDi6ym3Ny0</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359212 Mon, 28 Mar 2022 21:37:07 +0000 531 359212@http://citycyclingedinburgh.info/bbpress/ <p>Tension definitely not too far from other bikes I can easily compare with. The chainring bolts all seem good. Teeth look ok. </p> <p>I notice the derailleur pulley wheels have a little flex. I think they must be designed to do that though. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359211 Mon, 28 Mar 2022 20:51:36 +0000 chdot 359211@http://citycyclingedinburgh.info/bbpress/ <p>“But I did have it pop off the inner once toward the inside.“</p> <p>Presume bolts are tight and ring/teeth straight??</p> <p>Hard to advise on state of rear mech. </p> <p>Is tension on chain similar to other bikes? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359209 Mon, 28 Mar 2022 20:24:24 +0000 531 359209@http://citycyclingedinburgh.info/bbpress/ <p>I don't think the chainring is worn. It was new 5 years ago and the bike gets modest use. It certainly does not look worn. But I did have it pop off the inner once toward the inside.</p> <p>The chain tension looks somehow reasonable to me by the eyeball method. Can you give a rule of thumb to check if this is correct? As the derailleur on the steel bike around 50 years old, it certainly cannot be ruled out that the spring is a bit knackered. Can they be re invigorated or do you have to buy a new one? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359207 Mon, 28 Mar 2022 19:25:43 +0000 chdot 359207@http://citycyclingedinburgh.info/bbpress/ <p>“Chain has been replaced. Freewheel (7 speed) replaced.”</p> <p>Well</p> <p>‘Logical’ answer is very worn chainring. </p> <p>Other suggestion would be ‘is rear mech tension spring ok’?</p> <p>In connection with latter, is chain too long? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20894#post-359206 Mon, 28 Mar 2022 18:58:16 +0000 531 359206@http://citycyclingedinburgh.info/bbpress/ <p>OK, I want to get on my bike, one of them. I have an old steel bike and a less old carbon. Both have problems this year and I cannot unravel them. </p> <p>Steel bike. Chain is skipping! only starting off from a dead stop. But almost every dead stop! It's dangerous if you are racing in front a bus. No autoshifting. Just a loud noise as it skips then you start off and you lose all forward locomotion. Often you can recover after this happens and it is fine until the next full stop.</p> <p>Here is what I have done: Chain has been replaced. Freewheel (7 speed) replaced. I think the old ones were OK but they were getting old. Problem unchanged. derailleur (nuovo record) cleaned up and pulleys inspected - they look very good! I am sure I had them off last year but they spin easy. Alignment of derailleur is fine. Chain tension seems fine in all gears. Checked cable tension (not sure why this would matter in a friction drivetrain but it is fine). Note that the bike setup was perfect 2 years ago but I already noticed this skipping problem last year (and had tried to fix).</p> <p>Second problem - the carbon. A little clicking sound around the BB. Does not seem completely periodic but mostly so. Noted that the click seems to get milder under full load like going up hill. Here's what I did yesterday, mostly replacements from my toolbin or else rebuilds: chain, chainring bolts, bottom bracket, pedal axles (one had a little play in it), clean and reinstall jockey wheels, check and lube all cables. Same annoying click. Also checked headset and saddle/seatpost as well as cleat/shoe contact. I think this problem developed at the end of last season.</p> <p>I invite all puzzle solvers to submit their suggestions. If you can spot the problem, I promise you will get your reward in heaven or possibly even sooner. </p>