I'm a champion bike mechanic...
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Re: I'm a champion bike mechanic...
Postby Duck! » Mon Mar 18, 2024 7:52 pm
Rotors with solid steel brake tracks can be worn to less than 1.5mm; like most things, that figure is calculated with a fair margin for safety. However Shimano's IceTech rotors, which have a thin veneer of stainless steel on each side of an aluminium core are very precise about wear limits, because if the steel skins gets too thin, they'll blister, wear through, and you'll hack into the aluminium core very rapidly after that, with an equally rapid loss of brake function. Do not let these rotors get thinner than 1.5mm.
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Re: I'm a champion bike mechanic...
Postby Andy01 » Mon Mar 18, 2024 7:57 pm
For the record most verniers have a gap between the jaws near the slide end of the jaws to deal with just this sort of situation - probably not as good as a micrometer but should be good enough for this job.
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Re: I'm a champion bike mechanic...
Postby CmdrBiggles » Tue Mar 19, 2024 11:01 am
Verniers are fine (I have both Würth mechanical and Stanley electronic), so too are set pincers; skilled techs will often pick up a spent/dudded rotor (heavy scoring, abrasions, worn off laminate etc.) visually well before anything is brought out to measure it!
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Re: I'm a champion bike mechanic...
Postby OnTrackZeD » Tue Mar 19, 2024 1:10 pm
My verniers measured 1.4mm on disc but not easily repeatable so I bought a micrometer and it's 1.5mm repeatable.CmdrBiggles wrote: ↑Tue Mar 19, 2024 11:01 amA micrometer is definitely not necessary for checking rotor thickness.
Verniers are fine
Doesn't make much difference but I like the repeatability that the micrometer brings.
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Re: I'm a champion bike mechanic...
Postby DavidS » Tue Mar 19, 2024 8:28 pm
I'm trying to be a champion mechanic, after finishing work I have just volunteered for Back2 Bikes in Port Melbourne. Remembering how to do things on bikes I haven't done in decades!
DS
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Re: I'm a champion bike mechanic...
Postby ningnangnong » Tue Apr 02, 2024 9:37 am
I'm a heavy sweater, and a lot of it seems to drop down onto my FD. Other than wiping it down after every ride, is there something I can 'coat it' with that will help slow down the rusting process?
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Re: I'm a champion bike mechanic...
Postby CmdrBiggles » Tue Apr 02, 2024 10:23 am
ningnangnong wrote: ↑Tue Apr 02, 2024 9:37 amWhat would be the best product to protect my front dérailleur from rust/corrosion caused by sweat?
I'm a heavy sweater, and a lot of it seems to drop down onto my FD. Other than wiping it down after every ride, is there something I can 'coat it' with that will help slow down the rusting process?
Silicone spray.
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Re: I'm a champion bike mechanic...
Postby jasonc » Tue Apr 02, 2024 11:00 am
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Re: I'm a champion bike mechanic...
Postby CmdrBiggles » Tue Apr 02, 2024 12:13 pm
CmdrBiggles wrote: ↑Tue Apr 02, 2024 10:23 amningnangnong wrote: ↑Tue Apr 02, 2024 9:37 amWhat would be the best product to protect my front dérailleur from rust/corrosion caused by sweat?
I'm a heavy sweater, and a lot of it seems to drop down onto my FD. Other than wiping it down after every ride, is there something I can 'coat it' with that will help slow down the rusting process?
Silicone spray.
PS: If you (really?) live on Bikini Atoll, your bike will rust and corrode anyway!
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Re: I'm a champion bike mechanic...
Postby CmdrBiggles » Tue Apr 02, 2024 12:14 pm
ningnangnong wrote: ↑Tue Apr 02, 2024 9:37 amWhat would be the best product to protect my front dérailleur from rust/corrosion caused by sweat?
I'm a heavy sweater, and a lot of it seems to drop down onto my FD. Other than wiping it down after every ride, is there something I can 'coat it' with that will help slow down the rusting process?
Silicone spray.
PS: If you (really?) live on Bikini Atoll, your bike will rust and corrode anyway!
2021 Dragon Raptor e-scooter ['Yellow Peril']
- Duck!
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Re: I'm a champion bike mechanic...
Postby jasonc » Tue Apr 02, 2024 12:38 pm
woo
trying to get the guts to do the upgrade from grx mechanical to r8070 shifters myself. the di2 bit doesn't scare me I've built a few of them
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Re: I'm a champion bike mechanic...
Postby bychosis » Tue Apr 02, 2024 7:50 pm
Shifting went to pot in low gears onto he way home, I assumed it was mud in the drivetrain, but no. Looked down and found the rear QR lever open. Took a few turns befdoe it was tight enough again.
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Re: I'm a champion bike mechanic...
Postby jasonc » Tue Apr 02, 2024 8:29 pm
Do up the levers when the wheels are on the groundbychosis wrote: ↑Tue Apr 02, 2024 7:50 pmChanged tyres on the weekend. Reinstalled the through axles, something I don't do often.
Shifting went to pot in low gears onto he way home, I assumed it was mud in the drivetrain, but no. Looked down and found the rear QR lever open. Took a few turns befdoe it was tight enough again.
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Re: I'm a champion bike mechanic...
Postby Duck! » Tue Apr 02, 2024 8:35 pm
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Re: I'm a champion bike mechanic...
Postby jasonc » Wed Apr 03, 2024 10:05 am
I've had a thru axle undo when i did it up on the stand. i now tighten them on the groundDuck! wrote: ↑Tue Apr 02, 2024 8:35 pm^^ That's not really relevant for through-axles, but the ones with a Q/R-type locking lever need to be secured properly to stop them unwinding. Most frames are sprung slightly wider than their nominal spacing to make getting wheels in & out easier, so if the T/A isn't properly secured, the wheel can float laterally, which will stuff up shifting and/or braking.
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Re: I'm a champion bike mechanic...
Postby blizzard » Wed Apr 10, 2024 10:25 pm
Basically followed this video, very easy but seemed to waste a bit of grease grease compared to official way of degreasing the bearing / axle / pedal body and only adding 12mm or so of grease to the pedal body.
Last thing was after reassembling the drive side pedal there was a rattle... Luckily a quarter turn on the tension screw took care of it.
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Re: I'm a champion bike mechanic...
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Re: I'm a champion bike mechanic...
Postby P!N20 » Thu Apr 18, 2024 9:32 pm
So I can get the Sram bleed kit for $120, or save a few bucks and get the BBB bleed kit for $60, plus $17 for the Sram fluid. Is there any reason to avoid the cheaper bleed kit? I assume once you get a bleed kit you just need to buy the fluid in future - is that right?
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Re: I'm a champion bike mechanic...
Postby jasonc » Fri Apr 19, 2024 8:42 am
just make sure it has all the adaptors you need. there's a trick for young players with the non-brand shimano kits that you need to buy the adaptor specific to your series of shifter for the funnel
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Re: I'm a champion bike mechanic...
Postby blizzard » Fri Apr 19, 2024 9:40 am
The EZ-Mtb kits on Amazon / AliExpress are pretty good and very affordable. Just make sure it has the correct adaptors for your levers.P!N20 wrote: ↑Thu Apr 18, 2024 9:32 pmWanting to put my hard trash find Focus into commuting duties for a bit, the only thing stopping me is the brakes are a bit...average (Sram Rival hydraulic disc.) I've replaced the pads which improved things a bit, but there's still heaps of travel in the levers, so I'm thinking I need to bleed the brakes.
So I can get the Sram bleed kit for $120, or save a few bucks and get the BBB bleed kit for $60, plus $17 for the Sram fluid. Is there any reason to avoid the cheaper bleed kit? I assume once you get a bleed kit you just need to buy the fluid in future - is that right?
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Re: I'm a champion bike mechanic...
Postby jasonc » Fri Apr 19, 2024 12:34 pm
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Re: I'm a champion bike mechanic...
Postby bychosis » Fri Apr 19, 2024 3:36 pm
Ditto. One I got seems to have every imaginable variation.
The EZ-Mtb kits on Amazon / AliExpress are pretty good and very affordable. Just make sure it has the correct adaptors for your levers.
On the braking front, I installed new shimano hydro brakes on my cheapish MTB yesterday. Involved removing the rear calliper to internally route the hose. New olive etc to shorten it a little. All good. Decided I had the olive there so the front should get a trim too, at the lever end. First grab of the lever squirted oil onto myself and the ground. The olive hadn't seated properly. This morning cut off a little more and had another go with a spare olive and with more success.bike stops now.
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Re: I'm a champion bike mechanic...
Postby bychosis » Fri Apr 19, 2024 4:10 pm
The joys of buying a cheap, dissembled MTB with a stuck seatpost and the assembling it with not enough time spent.
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