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Wheels, Tyres and Brakes / Re: Confused by tyre pressures
« Last post by AdrianStone on July 10, 2026, 07:59:37 PM »
Thank you both, that's really helpful, I'd forgotten about the Thorn brochure and the 70/75psi seems a good place to start.
Thanks again for the help
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Wheels, Tyres and Brakes / Re: Confused by tyre pressures
« Last post by PH on July 10, 2026, 07:53:12 PM »
I have a tyre pressure app. based losely on the idea of a 15% drop (Compression) that suggests for those criteria, and smooth surfaces:
71 psi front
76 psi rear

I'd probably use 70/75 as a starting point and adjust from there. There's a margin of suitable pressures, the perfect ones depends on various factors, the tyre construction, riding style, priorities, and of course personal preference.

EDIT - Funnily enough, 70/75 is the recommendation in UKTony's link, though had you and bike been 20kg lighter, or heavier, the app would have given a different result.  I am a bit suspicious of pressure recommendations that don't consider load on the tyre.
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Wheels, Tyres and Brakes / Re: Confused by tyre pressures
« Last post by UKTony on July 10, 2026, 07:17:10 PM »
You could start by experimenting with the recommended pressures given on page 40 of Thorn’s online Mega Brochure at the following link. I’m a few kg lighter than you and don’t carry heavy panniers. Others on this forum know a lot more about tyre pressures etc and when you might want to raise or lower pressures in certain riding conditions. I’ve kept it simple and stuck with these recommendations on my 26” Nomad and 700c Mercury for the last 12 years and they’ve worked for me on variety of surfaces.


https://www.sjscycles.com/thornpdf/thorn_mega_brochure.pdf
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Wheels, Tyres and Brakes / Confused by tyre pressures
« Last post by AdrianStone on July 10, 2026, 06:11:10 PM »
I've not had my Club Tour long, well, almost a year, but a lot of that time has been restoring it. I've just changed the tyres as the previous Pasela Tour Guards were worn and suffered a cut side wall and puncture, so replaced with Pasela Protite which i understand to be the new version of these, the size is 700 x 32.

The sidewall states 95psi, this seems quite hight to me, but I know nothing. I've tried reading the articles on tyre pressures, but it all seems a bit esoteric and geeky... could some please just tell me what pressures should be used please?

I'm a bit fat at 97kg, plus panniers for camping, so maybe another 30/35kg including the bike?

Thanks
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Electric Conversions of "Manual" Bikes / Re: Bafang PAS senso
« Last post by Andre Jute on July 08, 2026, 07:19:33 PM »
There's a clearer photo of the sensor, and its receiver, in my 2012 set of articles Building an Electric Bike, which deals with fitting a Bafang front-drive motor and its control elements, starting at
https://www.coolmainpress.com/BICYCLINGbuildingpedelec1.html
The second article
https://www.coolmainpress.com/BICYCLINGbuildingpedelec2.html
contains the clearest photo of the sensor and receiver:


Note that while I left off the sensor and its assorted electronics as counterproductive to my intention on hand of advice from my local police here in Ireland, in Britain fitting the sensor may be a regulatory matter depending on the intended use of the bike. (On my current installation of a Bafang centre motor on my everyday bike which is not a Thorn, the sensor and its receiver are both internal.)
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Thorn General / Re: Kickstand Options for a Mk2 Sherpa?
« Last post by Binky on July 08, 2026, 06:58:33 PM »
The Hebie stand Martin linked looks like it attaches generally the same as the Greenfield, so whichever is easier for you to acquire would be good. The Hebie does look more refined to me from the photo.

PS Welcome to the forum and congrats on the new-to-you Sherpa!

Thanks for the welcome. I'll probably have plenty more questions in the future!
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Thorn General / Re: Kickstand Options for a Mk2 Sherpa?
« Last post by RonS on July 08, 2026, 04:11:49 PM »
The Hebie stand Martin linked looks like it attaches generally the same as the Greenfield, so whichever is easier for you to acquire would be good. The Hebie does look more refined to me from the photo.

PS Welcome to the forum and congrats on the new-to-you Sherpa!
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Bikes For Sale / Re: Facebook ad: 969 Thorn Sherpa 485L £350 Newbury
« Last post by Binky on July 08, 2026, 01:52:59 PM »
Hi all. I can confirm it is a 485L from the serial number as it's now found a new home!
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Thorn General / Re: Kickstand Options for a Mk2 Sherpa?
« Last post by Binky on July 08, 2026, 01:48:46 PM »
Thanks for the options, folks. I will check those suggestions out.
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Thorn General / Re: Kickstand Options for a Mk2 Sherpa?
« Last post by martinf on July 08, 2026, 01:24:44 PM »
I'm not a fan of kickstands for my own use. I can nearly always find a wall, fence or tree to lean the bike on, if not I lay the bike on it's side, drivetrain upwards.

But the users of the pool of 6 bikes I maintain for a nature reserve insist on having them.

The two second-hand electric bikes have substantial kickstands that attach to custom mounts on the chainstay near the rear axle. They work well, but are not an option for retrofit to a Thorn.

Two of the non-electric bikes I renovated had relatively lightweight frames without plates to mount a kickstand under the bottom bracket. I used Hebie 672V Fox kickstands that are bolted to both the chainstay and the seatstay :
https://www.bike-components.de/en/Hebie/672V-FOX-L-rear-kickstand-p56518/?o=1000180855-black-29-
It is possible to get the parts needed to fit an under bottom bracket kickstand to a frame which doesn't have the appropriate mounting plate brazed to the chainstays. But as the single bolt has to be really well tightened, in my experience with second-hand bikes, the chainstays often get deformed or slightly crushed.

The other two renovated bikes had plates brazed between the chainstays to accept a bolt-on kickstand under the bottom bracket. On one of these I fitted a Hebie Central Kickstand 630 LEX :
https://www.bike-components.de/en/Hebie/Central-Kickstand-630-LEX-p20531/
This is cheaper than the 672V Fox, but the single bolt needs to be done up REALLY tight.
The other one (an old Peugeot) still had the original Heslin kickstand.

Bear in mind that I am not a fan of kickstands, but on test rides with these 6 bikes I preferred the stands that fit near the rear axle, they seemed more stable with heavily loaded rear panniers (think shopping or cycle-camping). Of the two under bottom bracket stands I reckoned that the Hebie Central Kickstand 630 LEX was better than the old Heslin, probably because it was adjustable.

The two Hebie kickstands come in several versions, designed for different wheel sizes. But there is some adjustment.

All the kickstands I mention are compatible with a Duramaxx Mountee trailer that has the towing attachment bolted to the rear axle.
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