Incorrect, it's more likely - but still very rare - with brakes that use DOT fluid (SRAM, Hayes & others); the fluid absorbs moisture and expands, increasing the volume of fluid in the system. Mineral oil systems such as Shimano, Tektro and Magura do not absorb moisture, so the fluid volume doesn't increase.blizzard wrote: ↑Sat Aug 31, 2024 6:59 amAlso for Shimano it's possible to burst the bladder in the lever pushing the piston back in, so to be safe you can crack the bleed port on the lever. I've never done it and haven't had an issue, I think it's more a shop mechanic thing that incase the system has extra fluid in it because it was bled incorrectly previously.
I'm a champion bike mechanic...
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Re: I'm a champion bike mechanic...
Postby Duck! » Sat Aug 31, 2024 11:41 am
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Re: I'm a champion bike mechanic...
Postby blizzard » Sat Aug 31, 2024 2:54 pm
Thanks Duck for the correction. I've heard Dave Rome talk about cracking the bleed port, when pushing pistons as a precaution, not sure what his context was.Duck! wrote: ↑Sat Aug 31, 2024 11:41 amIncorrect, it's more likely - but still very rare - with brakes that use DOT fluid (SRAM, Hayes & others); the fluid absorbs moisture and expands, increasing the volume of fluid in the system. Mineral oil systems such as Shimano, Tektro and Magura do not absorb moisture, so the fluid volume doesn't increase.blizzard wrote: ↑Sat Aug 31, 2024 6:59 amAlso for Shimano it's possible to burst the bladder in the lever pushing the piston back in, so to be safe you can crack the bleed port on the lever. I've never done it and haven't had an issue, I think it's more a shop mechanic thing that incase the system has extra fluid in it because it was bled incorrectly previously.
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Re: I'm a champion bike mechanic...
Postby g-boaf » Sat Aug 31, 2024 3:00 pm
It needed bleeding, that's done now and it's happy again. I was admittedly tired and short of patience yesterday.
The morning ride I took the Canyon Ultimate CF Evo out instead - which worked out well because it was so gusty. The S5 would have been blown about terribly.
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Re: I'm a champion bike mechanic...
Postby DavidS » Sat Aug 31, 2024 11:37 pm
Must remember to clean the pistons next time I replace pads, forgot last time. Plenty of isopropyl here, I use it to clean records.
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Re: I'm a champion bike mechanic...
Postby jasonc » Sun Sep 15, 2024 8:56 am
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Re: I'm a champion bike mechanic...
Postby Retrobyte » Sun Sep 15, 2024 10:38 am
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Re: I'm a champion bike mechanic...
Postby jasonc » Sun Sep 15, 2024 11:06 am
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Re: I'm a champion bike mechanic...
Postby Duck! » Sun Sep 15, 2024 11:13 am
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Re: I'm a champion bike mechanic...
Postby warthog1 » Sun Sep 15, 2024 11:54 am
I have a 240v compressor with a storage tank that will run a paint spray gun. I whip the valve out and blast air in through the stem to seat the tyre with that. Sometimes it takes significant pressure to get the tyre to "pop" over the bead.jasonc wrote: ↑Sun Sep 15, 2024 8:56 amafter my tubeless tyre failed to stay inflated, even after plugging it, I put a tube in it. So I bought a new tyre, and new valve. After about 10 different efforts I have finally got the tyre to stay inflated. The soapy water on the bead, and the right rubber bits on the valve finally did it. what a pain. I used a floor pump without the valve installed to pump it up. Before the soapy water I just don't think it was sealing in the bead properly. Now I just need to insert the sealant
Once seated I put sealant in througn the rim with a Stans syringe designed for the purpose. Reinflate and put the wheel on its' side and wobble it around to coat the tyre and the bead on both sides. Usually all good after that.
A comparitive pita to install a new tyre compared to tube but the reduction in punctures has more than offset it for me.
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Re: I'm a champion bike mechanic...
Postby jasonc » Sun Sep 15, 2024 12:05 pm
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Re: I'm a champion bike mechanic...
Postby bychosis » Sun Sep 15, 2024 12:08 pm
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Re: I'm a champion bike mechanic...
Postby Retrobyte » Sun Sep 15, 2024 4:18 pm
Thanks Duck, I did work all that out eventually. With the chain off the bike my first challenge was working out the rotation direction for each pulley, trying to visualise it with no chain there. And the Googling I did initially was confusing in some descriptions of which pulley is guide and tension - I couldn't work out which one was "top" at first because the cage was horizontal so both neither pulley was "closest to the cassette". Something so simple in theory but several things to work out before I got it rightDuck! wrote: ↑Sun Sep 15, 2024 11:13 amShimano jockey wheels are usually marked "G-pulley" for the top, guide pulley, and "T-pulley" for the bottom, tension pulley, and are marked with rotation direction arrows. In some generations of derailleurs, the t-pulley is asymmetrical, so even if it's in the right place, if it's the wrong way around it can foul on the derailleur cage.
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Re: I'm a champion bike mechanic...
Postby jasonc » Mon Sep 16, 2024 8:03 am
the tubeless tyre survived the journey in. looks like it was a success.jasonc wrote: ↑Sun Sep 15, 2024 8:56 amafter my tubeless tyre failed to stay inflated, even after plugging it, I put a tube in it. So I bought a new tyre, and new valve. After about 10 different efforts I have finally got the tyre to stay inflated. The soapy water on the bead, and the right rubber bits on the valve finally did it. what a pain. I used a floor pump without the valve installed to pump it up. Before the soapy water I just don't think it was sealing in the bead properly. Now I just need to insert the sealant
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Re: I'm a champion bike mechanic...
Postby Mr Purple » Mon Sep 16, 2024 8:23 am
It's about the only way you can guarantee it'll bead up, and neither is a huge investment.
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Re: I'm a champion bike mechanic...
Postby Andy01 » Mon Sep 16, 2024 8:42 am
So I fired up the compressor and blasted it up to around 65psi, and the tyres made 2 or 3 loud "pops" and job done.
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Re: I'm a champion bike mechanic...
Postby jasonc » Mon Sep 16, 2024 8:43 am
well I don't have an air compressor. I was tempted to buy one half way through saturday, but I got there
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Re: I'm a champion bike mechanic...
Postby Mr Purple » Mon Sep 16, 2024 9:10 am
Even one of these makes life a lot easier.
https://www.pushys.com.au/airshot-tyre- ... 6AODvjyZWV
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Re: I'm a champion bike mechanic...
Postby CmdrBiggles » Mon Sep 16, 2024 9:49 am
240V compressors should be left to the purpose for which they were designed — low pressure, high volume inflation of car tyres and more sturdy objects than pricey bike tyres.
C02 cartridges are also a quick and efficient way of speedy inflation without such pricey toys as the device at Pushys.
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Re: I'm a champion bike mechanic...
Postby find_bruce » Mon Sep 16, 2024 10:17 am
At $90 for 1.15 litres, I'd look at using a 2 litre soft drink bottle (burst pressure should be 150-170 psi, so 100 psi should be fine) empty fire extinguisher, or even a 5 litre pressure sprayer from BunningsMr Purple wrote: ↑Mon Sep 16, 2024 9:10 amEven one of these makes life a lot easier.
https://www.pushys.com.au/airshot-tyre- ... 6AODvjyZWV
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Re: I'm a champion bike mechanic...
Postby jasonc » Mon Sep 16, 2024 10:47 am
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Re: I'm a champion bike mechanic...
Postby warthog1 » Mon Sep 16, 2024 11:08 am
Interested in how well it works.
I had the compressor already so just decided to use it to seat tubeless too. Pretty hard to beat for dumping a large volume of pressurised air quickly imo.
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Re: I'm a champion bike mechanic...
Postby OnTrackZeD » Mon Sep 16, 2024 5:41 pm
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