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71
Transmission / Re: Replace chain
« Last post by PH on July 25, 2026, 10:13:35 AM »
Quote from: jul on July 25, 2026, 09:11:13 AM
Ok, but sometimes when your replace only the chain, an unpleasant noise appears the first hundred kilometers
Then you've left it too long, the wear on the sprocket, and possibly the chainring, is beyond the tolerance of the new chain.  What you're doing, that noise, is premature wear on the new chain till it matches the sprocket.  the economic thing to do in that instance, is to put the old chain back on.  If you're going down the route of swapping chains to preserve other components, you have to frequently measure and not go by mileage.
Riders can do what they choose, but there are two practical options, wear it all out and replace together or replace chains before anything else is worn.  Doing something between those two has no advantage and will cost more in components than either.
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Transmission / Re: Replace chain
« Last post by jul on July 25, 2026, 09:11:13 AM »
Ok, but sometimes when your replace only the chain, an unpleasant noise appears the first hundred kilometers
73
Non-Thorn Related / Re: The Bone Phone is here. Is it any good for cyclists?
« Last post by in4 on July 25, 2026, 06:48:33 AM »
Thanks for the useful reply Andre. Ill take a look at yours. The JL ones might be aimed at runners, I dont know. I did try them for sound and the bass was quite shallow. That might be in the nature of BCs though. Thanks again
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Non-Thorn Related / Re: The Bone Phone is here. Is it any good for cyclists?
« Last post by Andre Jute on July 25, 2026, 03:40:15 AM »
Quote from: in4 on July 24, 2026, 06:21:42 PM
....I might use BC's for audio route prompts though.

Here's an example from JL

https://www.johnlewis.com/shokz-openmove-bluetooth-wireless-open-ear-headphones-grey/p110575797

Yes, I thought routing instructions might be one use for cyclists.

I don't know anything about the John Lewis item you refer to, but I wouldn't have thought it would be particularly suitable for a cyclist. Mine have a half-loop over the ear to position them positively (photo in my original post) while the one from JL you illustrate looks like backwards cafe-racer sunglasses that will slide off your ears -- also backwards -- at the first sleeping policeman you ride over. More fashion than kinesthetics...

Also, they seem a bit pricey to me for something you intend to use only for the presence frequency range.

BTW, the ones I bought are more than reasonably water-resistant. Earlier tonight they fell off a stack of watchboxes on which they were balanced for charging and into my lime and honey tea. I rescued them, shook them a bit to get the running liquid off, put the captive rubber plug back in the USB-C charging port after blowing into the port, and tried them with music, and allelujah, they worked fine.
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Non-Thorn Related / Re: The Bone Phone is here. Is it any good for cyclists?
« Last post by in4 on July 24, 2026, 06:21:42 PM »
I'd consider using them, despite finding the audio quality a bit poor. John Lewis stock them. I never use earbuds on the bike, in fact I've decided not to use them at all because they prevent ears from 'breathing' I might use BC's for audio route prompts though.

Here's an example from JL

https://www.johnlewis.com/shokz-openmove-bluetooth-wireless-open-ear-headphones-grey/p110575797
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Bikes For Sale / Re: THORN EXP’s for sale
« Last post by PeteFS on July 24, 2026, 04:24:35 PM »
Hi
Thanks for the contact.
Photos are too large for here.  Are you on WhatsApp?
77
Transmission / Re: Replace chain
« Last post by PH on July 24, 2026, 10:55:02 AM »
Quote from: jul on July 23, 2026, 09:35:52 PM
Quote from: HugoC on July 23, 2026, 08:53:05 PM
Hello,
On my Thorn Raven Twin, I replace my chain about every 7500kms and have just recently replaced the chainrings and sprocket for the first time after accumulating about 44000kms.
Regards
Hugo

44000 kms with a Rohloff Sprocket ! Are you sure ? it’s a lot of kilometers
If you change the chain often enough, you can make a sprocket and chain ring last almost indefinitely.  The question is if it makes economic sense, as in - are you spending more on chains than you would replacing the other components? There is some disagreement on the answer to that, it depends... IMO it makes little cost difference, but letting it all wear out requires less maintenance.
I swapped (Or flipped) the lot on my Mercury at around 27,000km, though that bike doesn't see the worst of the weather or much off-road. On the wet weather/off-road Nomad I'm still expecting 15,000+ km.
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Bikes For Sale / Re: Facebook ad: 969 Thorn Sherpa 485L £350 Newbury
« Last post by Willcol on July 23, 2026, 10:46:32 PM »
Apologies for not replying, I must have missed the notifications. I had the seller photograph the BB and figured the sizing codes out from those photos.
If you are the new owner Binky, hope you enjoy! 
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Transmission / Re: Replace chain
« Last post by jul on July 23, 2026, 09:35:52 PM »
Quote from: HugoC on July 23, 2026, 08:53:05 PM
Hello,
On my Thorn Raven Twin, I replace my chain about every 7500kms and have just recently replaced the chainrings and sprocket for the first time after accumulating about 44000kms.
Regards
Hugo

44000 kms with a Rohloff Sprocket ! Are you sure ? it’s a lot of kilometers
80
Transmission / Re: Replace chain
« Last post by HugoC on July 23, 2026, 08:53:05 PM »
Hello,
On my Thorn Raven Twin, I replace my chain about every 7500kms and have just recently replaced the chainrings and sprocket for the first time after accumulating about 44000kms.
Regards
Hugo
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