Search found 268 matches

by Pneumant
15 Apr 2024, 7:24pm
Forum: Bikes & Bits – Technical section
Topic: VP Square Taper Cartridge BB rebuild query
Replies: 9
Views: 466

Re: VP Square Taper Cartridge BB rebuild query

fastpedaller wrote: 14 Apr 2024, 8:17pm If you have the means to make a spacer to fit inside the left cup that will be ideal - the other possibility is to use a 73mm BB in a 68mm shell thus achieving enough width for a lockring, The BB can then be assembled without preload on the bearings and indeed the inner sleeve can be 'removed/ cut away' so the bearings can be greased sufficiently.
That is the plan,the left cup has a generous amount of thread which leads me to believe that a spacer (or two) will work :D
Brucey wrote: 14 Apr 2024, 9:33pm would it not be just as easy (if not even easier) to make a spacer to be fitted to the spindle? I suspect that you can make something suitable out of an old spoke. btw if the bearing outers are a sliding fit in the cups (or the inners a sliding fit on the spindle come to that), it isn't a bad idea to use bearing fit compound or similar.
Possibly and that is another option.
Cyclothesist wrote: 15 Apr 2024, 8:19am I'm interested to know why you needed to completely split the central spacer? If it didn't move as easily as the one in the video in the linked thread wouldn't a blunt punch and hammer applied nearby one bearing produced enough distortion to get the first bearing off? Your spacer is then much more easily repurposed. Of course it's always easy to be the armchair critic after the event so I'm assuming there's a reason that wasn't an option.
I did attempt to knock the bearings off but they were reluctant. I could have used heat but chose instead to remove the spacer and use a puller. This was a knackered spare BB from my winter fixed wheel bike so nowt to lose! Not having a spacer means re-packing the bearings will become a simple task and a good fit for a low maintenance easily maintained bike. So long as I end up with an easily serviceable BB I am happy 8) .
by Pneumant
14 Apr 2024, 7:01pm
Forum: Bikes & Bits – Technical section
Topic: VP Square Taper Cartridge BB rebuild query
Replies: 9
Views: 466

Re: VP Square Taper Cartridge BB rebuild query

Brucey wrote: 13 Apr 2024, 8:47pm without the spacer, the BB would need at least one lockring. The spacer normally allows you to fully tighten a lockringless LH cup, by accepting a high load in compression. You can use a length of tube as a substitute but it needs to be the exact correct length (as per the bearing spacing on the spindle) ideally plus a small allowance (no more than ~0.2mm or so) to allow for the elastic compression of the spacer when the LH cup is tightened.
btw a 6002 bearing is usually 15mm bore, 32mm OD, 9mm width.It isn't a bad idea to measure up carefully; I have heard of seals with 6002 writ upon them being found in bearings of a quite different size. I suggest that you also convert the bearings to DFC specification.
Thank you Brucey - good advice as usual. My Omas BB does have lock rings which explains why no spacer tube, For the VP BB rather than faff round with making a replacement spacer tube it would be better to add a spacer inside the non-drive side cup and a lock ring to hold in place. I am not sure what DFC spec bearings are? Huge choice out there though! That way I end up with a BB with easily replaced bearings :D
by Pneumant
14 Apr 2024, 6:46pm
Forum: Bikes & Bits – Technical section
Topic: VP Square Taper Cartridge BB rebuild query
Replies: 9
Views: 466

Re: VP Square Taper Cartridge BB rebuild query

Cyclothesist wrote: 13 Apr 2024, 7:16pm Good thread on this subject here
viewtopic.php?p=1749671#p1749671
Brucey is the man who's brains to pick
Many thanks for responding, as a contributor to that particular thread I perhaps should have added to that post :D
by Pneumant
13 Apr 2024, 7:03pm
Forum: Bikes & Bits – Technical section
Topic: VP Square Taper Cartridge BB rebuild query
Replies: 9
Views: 466

VP Square Taper Cartridge BB rebuild query

Today I disassembled a worn out VP square taper bottom bracket with a view to rebuilding it with fresh bearings, 6002RS size. I had to cut off the central alloy 'spacer' to pull the bearings off the axle. The spacer's function appears to be that of keeping the bearings a set distance apart, possibly to support them and finally to make the BB look like a Shimano type cartridge BB. My question is whether this spacer is absolutely necessary and should I rebuild omitting this part? Out of interest I have a vintage Italian Omas BB in my spares which is much the same without the spacer and that works fine! If not I can find some way to bodge the spacer back into use :D
by Pneumant
24 Mar 2024, 6:41pm
Forum: Bikes & Bits – Technical section
Topic: Campag freehub failure
Replies: 17
Views: 1329

Re: Campag freehub failure

Recently a bike with Campag 8-speed found its way into my ownership and I have slowly been servicing it. I used to run Campag 8-speed back in the 90's and I had forgotten just how weird the rear hub is! I can't think of any other hubs where you have to dismantle pawls and tiny springs just to get at the bearings. The nearside bearings are in the right place but the smaller middle ones are inboard with the drive side axle being supported by the freewheel bearing. The pre-load is applied by screwing on the 17mm hex nut secured by a 2mm grub screw. More weirdness! Shimano hubs are simples in comparison.
by Pneumant
23 Mar 2024, 9:18am
Forum: Bikes & Bits – Technical section
Topic: Bike Stand recomendations
Replies: 8
Views: 515

Re: Bike Stand recomendations

https://www.ebay.co.uk/itm/275112004251
Very useful stands indeed - cleaning, bike adjustments, maintenance. I find 700c road and 26" wheel mountain bikes fit without adjustment. Not suitable for folding Brompton bikes though. I prefer mine over the full size bike work stand as really is grab and go.
by Pneumant
23 Mar 2024, 8:43am
Forum: For Sale - bits of bikes, etc.
Topic: Retro mavic wheelset on hope hubs
Replies: 12
Views: 1621

Re: Retro mavic wheelset on hope hubs

Very nice wheel set and these look like 700c Mavic Reflex blue rims which are long discontinued and desirable. Great to see esoteric hard to find items posted up on this section of the forum! Good luck with the sale and you might find a more receptive audience via the retrobike website.
by Pneumant
31 Dec 2023, 9:06am
Forum: Bikes & Bits – Technical section
Topic: Stem sheared off, remains seized in fork
Replies: 35
Views: 2504

Re: Stem sheared off, remains seized in fork

Hi, You'll find it difficult to use a.hacksaw in the restricted internal space of a quill stem. If this stem is truly seized then the easiest options are:
1) Remove the forks and use a caustic soda solution to dissolve the stem. If you invert the forks placing the steerer in the solution the chance of paint damage will be reduced. Take care when using caustic soda and use all appropriate PPE and control measures.
2) Replace the forks which will probably depend upon second hand availability.
Hope this helps...
by Pneumant
30 Dec 2023, 10:46am
Forum: Does anyone know … ?
Topic: Dirty bike... again!
Replies: 14
Views: 1046

Re: Dirty bike... again!

pwa wrote: 30 Dec 2023, 9:48am This subject has been done to death umpteen times, but is there anything new out there to do with chains and lube? Any new products that help stave off dirt, corrosion and wear?
Hi , yes the first would be to use sealed 'o' ring chains ( if they were available), the price to pay would be extra weight and friction. The second would be to enclose the chain which is problematic on a derailleur bike but doable on a single speed IGH gear bike. The third option of using products such as sprays and potions works up to the point when the mud filth water overwhelms them!
by Pneumant
10 Nov 2023, 7:30pm
Forum: Bikes & Bits – Technical section
Topic: Shimano Dura-ace DI2 ST-R9170 bleed port thread
Replies: 2
Views: 1059

Re: Shimano Dura-ace DI2 ST-R9170 bleed port thread

I feel for you and unfortunately one of those situations where you have nothing to lose with regard to repair. Repair wise I would opt for a thread insert. Hydraulic brakes are not a new technology and plenty of repair firms are to be found in the automotive / motorcycle world. I don't know this company but they are in London and may be worth calling >>https://pro-calipers.co.uk .
by Pneumant
18 Oct 2023, 8:21pm
Forum: Bikes & Bits – Technical section
Topic: Best wishes for Brucey
Replies: 613
Views: 74174

Re: Best wishes for Brucey

Brucey , I too could not believe that you had returned to the forum. But here you are and long may you keep posting. Your content is always worth reading and makes this place so much better. Welcome back :D
by Pneumant
18 Sep 2023, 7:38pm
Forum: Bikes & Bits – Technical section
Topic: Sturmey Archer RS-RF3 3/32” sprocket compatibility?
Replies: 2
Views: 268

Re: Sturmey Archer RS-RF3 3/32” sprocket compatibility?

DiTBho wrote: 16 Sep 2023, 9:23pm hi
I wonder if I can pair the Sturmey Archer's rs-rf3 (3 speeds) internal gear-hub with a 3/32” sproket.

Its part-list document only lists these 1/8" sprockets parts
  • HSL827 Sprocket 17T, 1/8" Deep Dished (Chrome)
  • HSL924 Sprocket 18T, 1/8" Deep Dished (Chrome)
  • HSL965 Sprocket 19T, 1/8" Deep Dished (Chrome)
and included with the RS-RF3 kit there is a 1/8" Dished 17T Sprocket.

Sturmey Arche also has 3/32" sprockects parts for a similar internal gear hub (e.g. the rx-rk5, a 5 speeds hub)
  • HSL201 Sprocket 19T, 3/32” Dished
  • HSL202 Sprocket 20T, 3/32” Dished
They look similar, but I can't understand if they can be used with the rs-rf3 :roll:
Yes the sprockets for these hubs all have three lugs and either 3/32 or 1/8 spec will fit. Shimano Nexus sprockets also fit. The important dimension is the dish on the sprocket which will affect the chain-line. A 3/32 chain setup will be less fussy as the chain has more side flex.
by Pneumant
18 Sep 2023, 7:20pm
Forum: Bikes & Bits – Technical section
Topic: Exustar EPS-R Cleat
Replies: 3
Views: 245

Re: Exustar EPS-R Cleat

Look delta pedal cleats also have these rubber pieces added, all these do, I think, is to reduce cleat/pedal rubbing noise. I also spray mine with gt85 which has the same result.
by Pneumant
13 Sep 2023, 7:40pm
Forum: Bikes & Bits – Technical section
Topic: 26" nutted rear wheel - new QR possible?
Replies: 12
Views: 753

Re: 26" nutted rear wheel - new QR possible?

Definitely worth trying your local bicycle recycling scheme for a good used wheel. Not sure where you are located but most larger towns seem to have one...
by Pneumant
9 Jul 2023, 4:24pm
Forum: On the road
Topic: The joy of three speed riding
Replies: 80
Views: 5605

Re: The joy of three speed riding

For commuting I built a 3-speed AW hub into a 26" MTB wheel, re spaced the chainstays of my mid 90's steel MTB frame to make it fit and because the chain kept flying off on the bumpy off road part of my commute, cobbled together a home-brewed chain tensioner. This bike is good fun to ride and characterful! Very low maintenance compared to a derailleur geared bike. The hub gear looks great when cleaned up but I really prefer the look of it when covered in oil and filth......and yet ......it continues to work perfectly like that.
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