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Wheels, Tyres and Brakes / Re: Confused by tyre pressures
« Last post by PdE on Today at 02:54:33 AM »
Silca (who make tire pumps among other things) has a tire pressure calculator that takes rider weight, tire size, tire type, riding style, and road surface into account.  The results seem a bit low to me but I have to think that they have at least a bit of knowledge on the subject.  If nothing else, another data point to consider
https://silca.cc/pages/pro-tire-pressure-calculator
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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 »
Quote from: 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!

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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