Search found 234 matches

by Pneumant
3 Oct 2021, 6:15pm
Forum: Bikes & Bits – Technical section
Topic: Iffy chinese brake pads ?
Replies: 7
Views: 454

Re: Iffy chinese brake pads ?

brucelee wrote: 1 Oct 2021, 4:46pm So I got some of these off aliexpress :IMG_20211001_144054.jpgIMG_20211001_144135.jpg for my R8070 disc brakes and started looking for the flaws. It seems to me that when the brakes is applied, the force on the pad needs to be applied to the calliper for the pad to remain in place and that this is done via the trailing edge of the pad backing. I compared these to some 'used' (or as ribble would call them 'new') metal pads and found that there was a considerable difference in the area of the pad that bearing onto the calliper :
chinese padsIMG_20211001_144738.jpgIMG_20211001_144819.jpg
ultegra padsIMG_20211001_145336.jpgThe backing material on the Chinese pad is also rough where the ultegra pad is smooth. It occurs to me that this might cause significant wear to the calliper because of the forces and materials (Alu calliper, guessing steel backing) involved. Also, with a worn out pad, the possibility of the backing getting jammed between the calliper body and disk causing a lock up. Anyone got any experience with these sorts of things happening ?
Also kind of gives me the impression there should some sort of lubricant (copper grease?) applied to this edge on installation but there is nothing in the dealers manual about it. It's an awful lot of force between two very small surfaces grinding against each other.
Cheers,
Bruce.
Hi, as others have commented there are both good and bad pattern parts which can differ <slightly> from OE due to design patents etc. EBC now make pads for bicycles and are a respected name in the automotive world. If the backing is rough on the new pad I would correct using emery cloth or/and a metal file. I always do a spot of strategic filing when fitting car / motorcycle brake pads as a tight fit in the caliper is not desirable. It probably does not matter that the overall pad thickness is different to OE, the pistons won't pop out if that is what concerns you. Don't use copaslip on the back of pads as the generated braking heat will make it run off! Use red rubber grease instead and also dab onto the exposed piston. Copaslip is perfectly ok to use on the pins though.
by Pneumant
21 Sep 2021, 8:16pm
Forum: Does anyone know … ?
Topic: New seatpost
Replies: 8
Views: 441

Re: New seatpost

Hi, the twin bolt design permits the saddle angle to be set accurately, the drawback is they can have less layback compared to single bolt designs. Deda is a good brand and not overly expensive either. They make decent single bolt designs too. My favourite seatpost design is the older mid 90's Campag Chorus which relies upon tight tolerances (no notches required!) to clamp the saddle in any position. Downside is that this post is probably too short for sloping top tube design frames.
by Pneumant
21 Sep 2021, 7:51pm
Forum: Bikes & Bits – Technical section
Topic: Front derailleur bent? Shimano Sora FD-R3030
Replies: 14
Views: 634

Re: Front derailleur bent? Shimano Sora FD-R3030

Hi, agree indexed mechs can be a pain to set up. As a quick fix check that your cable is free moving and that the shifter is not lethargic. If it is squirt some solvent in followed by spray grease. Reinstall the cable taking care to not over tension. For a more involved fix and looking at your pictures it appears like your mech is set quite high and also not quite parallel with the outer chain ring. This will effect the change. Try dropping the mech so the outer cage is 2-3mm from the outer ring at the closest point, also loosen the cable clamp and mech clamp bolt to align the outer mech cage so it is parallel with the chainring, again make sure the cable is not too tight. Don't be afraid to gently tweak the cage plates to sweeten the change.
by Pneumant
14 Sep 2021, 8:44pm
Forum: Family Cycling
Topic: Wye Valley Greenway
Replies: 12
Views: 1517

Re: Wye Valley Greenway

Bmblbzzz wrote: 14 Sep 2021, 8:29am When you say "the path closes" presumably that's the tunnel? I don't see how they could close the rest of the path. Or do they? Or is this to be determined?
Just the tunnel, there is an alternative cycling route marked in blue on the attached map, also pic of the tunnel opening times. The tunnel is good fun to pass through what with the low level lighting and dripping water, very atmospheric!
wvg.JPG
Tidenham Tunnel.JPG
Tidenham Tunnel.JPG
by Pneumant
23 Aug 2021, 7:56pm
Forum: Bikes & Bits – Technical section
Topic: Shimano Ultegra BB Impossible bearings?
Replies: 8
Views: 447

Re: Shimano Ultegra BB Impossible bearings?

Jamesh wrote: 23 Aug 2021, 1:13pm I do miss brucey posts....

Cheers James
I too miss reading Brucey's excellent posts,
by Pneumant
22 Aug 2021, 9:37pm
Forum: Bikes & Bits – Technical section
Topic: How do I access this bolt?
Replies: 33
Views: 1314

Re: How do I access this bolt?

slowster wrote: 22 Aug 2021, 8:51pm
Pneumant wrote: 22 Aug 2021, 8:38pm Ta for the pics but still not enough for a definitive response.
What else could it be other than a square taper bottom bracket, given that they are Shimano cranks secured with an external hex bolt.
Am afraid that it could be either type as both use external hex bolts.
by Pneumant
22 Aug 2021, 8:52pm
Forum: Bikes & Bits – Technical section
Topic: Shimano Ultegra BB Impossible bearings?
Replies: 8
Views: 447

Re: Shimano Ultegra BB Impossible bearings?

fausto99 wrote: 22 Aug 2021, 3:38pm Idle curiousity really, but AFAICS, the bearings in a SM-BBR60 seem to be 35od x 25id x 6mm roller ball bearings. Looking on the Simply Bearings site, if you put in 25mm id, then the only choice of od is 32 or 37mm. So the question is, do Shimano use unobtainium non-standard bearings?!?
Check out Brucey's post >>
viewtopic.php?f=5&t=144219&p=1582240&hi ... t#p1582240
by Pneumant
22 Aug 2021, 8:38pm
Forum: Bikes & Bits – Technical section
Topic: How do I access this bolt?
Replies: 33
Views: 1314

Re: How do I access this bolt?

Homervanderlay wrote: 22 Aug 2021, 12:09pm
Pneumant wrote: 21 Aug 2021, 7:02pm Hard to say BB type without more pics, can you post a picture showing the axle where it fits into the back of the crank.
Having said that you say the bike is creaking badly? I would start simple and squirt fluid grease into the pedals, remove pedals and grease the pedal threads, check the chainring bolts are tight, grease the seatpost, check the saddle is tight. If still creaking then remove the BB and have a go at loobing it (prise the seals and squirt fluid grease in), grease the BB threads and tighten up. It is all about elimination really!
Some more pics below:
Ta for the pics but still not enough for a definitive response. If you are able to remove the bolt the BB type will be very obvious. Interestingly it looks like your frame has been faced for an external BB.
by Pneumant
21 Aug 2021, 7:08pm
Forum: Bikes & Bits – Technical section
Topic: Old MTB - raising handlebars problem
Replies: 6
Views: 324

Re: Old MTB - raising handlebars problem

Turn the bike upside down and <gently> using a long screwdriver etc knock the expander bolt nut back out through the top of the fork steerer. Clean up with wire wool and reassemble using moly grease. Job done!
by Pneumant
21 Aug 2021, 7:02pm
Forum: Bikes & Bits – Technical section
Topic: How do I access this bolt?
Replies: 33
Views: 1314

Re: How do I access this bolt?

Hard to say BB type without more pics, can you post a picture showing the axle where it fits into the back of the crank.
Having said that you say the bike is creaking badly? I would start simple and squirt fluid grease into the pedals, remove pedals and grease the pedal threads, check the chainring bolts are tight, grease the seatpost, check the saddle is tight. If still creaking then remove the BB and have a go at loobing it (prise the seals and squirt fluid grease in), grease the BB threads and tighten up. It is all about elimination really!
by Pneumant
12 May 2021, 8:37pm
Forum: Bikes & Bits – Technical section
Topic: Best wishes for Brucey
Replies: 522
Views: 40322

Re: Best wishes for Brucey

Thank you for sharing your news Brucey, really good to hear from you. My thoughts are with you and your continuing recovery.
by Pneumant
7 May 2021, 7:23pm
Forum: Does anyone know … ?
Topic: Powder coating..
Replies: 11
Views: 1493

Re: Powder coating..

Hi, Yes you need to cover the threaded parts to keep clear of powdercoat. Use masking tape and tape over all the bare metal part of the bosses. Same applies to the forks. Leave loose sacrificial bolts in mudguard eyes, brake & bottle bosses etc. Use old traditional BB cups in the BB. I would leave slightly loose and mask off the right cup facing edge and axle holes. Job done!
by Pneumant
23 Apr 2021, 9:28pm
Forum: On the road
Topic: Deliberate Close Passing /Assault and now just too scared to ride to work.
Replies: 47
Views: 5790

Re: Deliberate Close Passing /Assault and now just too scared to ride to work.

OP; unfortunately I think you encountered a sadistic bully in his cage there, reporting him is the right thing to do. He probably does this to other road users as well. You can check the MOT history of the vehicle here; https://www.gov.uk/check-mot-status. Might be a result if he is not legal, no MOT could also mean no insurance. Proverbial book thrown. Perhaps a couple of weeks off and then a change of route. Maybe consider an electric bicycle, scooter or small motorbike instead for the commute?
by Pneumant
20 Apr 2021, 8:03pm
Forum: Bikes & Bits – Technical section
Topic: Filling a small hole in a tyre
Replies: 15
Views: 777

Re: Filling a small hole in a tyre

mjr wrote: 20 Apr 2021, 8:56am
Pneumant wrote: 19 Apr 2021, 8:16pm
Use super glue, any brand. Perfect for repairing small cuts in tyres.
Doesn't that set hard, thereby forming a new sharp from the hole left by the previous one?
The superglue bonds the tyre back together rather than filling the hole; remove the tyre, bond and hold the cut together for a good join.
by Pneumant
19 Apr 2021, 8:16pm
Forum: Bikes & Bits – Technical section
Topic: Filling a small hole in a tyre
Replies: 15
Views: 777

Re: Filling a small hole in a tyre

Mr Tom wrote: 19 Apr 2021, 6:03pm There's lots of info out there on this, some of which seems a bit suspect. Just wanted to see what people on here thought was the best way to sort this out.

Is just a puncture which has left a hole right through the tyre. I've got some wetsuit glue called 'Black Witch' that I thought might do the trick, or bits of inner tube, gaffa tape. Any ideas?
Use super glue, any brand. Perfect for repairing small cuts in tyres.