Search found 629 matches

by bgnukem
24 Mar 2021, 6:51pm
Forum: Bikes & Bits – Technical section
Topic: Chainsets and BBs
Replies: 16
Views: 782

Re: Chainsets and BBs

fastpedaller wrote:
bgnukem wrote:Also IME the basic version (with 2 steel rings and an alloy outer) didn't work well with a 9-speed chain, which got stuck between the outer two 'rings on my bike.

I'm a bit puzzled by the above statement, as my XD2 (which I think is the 'basic' referred to) came with aluminium alloy rings, not steel. Are you referring to another Spa chainset?


Was recalling from memory as the original rings have been binned, but looks like you are right. The basic XD-2 set costing £38 comes with basic ali rings. The more expensive versions with 'zicral' aluminium alloy rings. I suspect the more expensive rings are wider than the cheapo ones (i.e. below the teeth) which perhaps makes it less likely a narrow chain (9-speed in my case) will get stuck between them.
by bgnukem
24 Mar 2021, 6:32pm
Forum: Bikes & Bits – Technical section
Topic: Rear wheel axle minor play - short term options?
Replies: 6
Views: 336

Re: Rear wheel axle minor play - short term options?

Check how the bearings feel by turning the axle by hand with the wheel removed from the bike. If they are rough the damage is already done and riding it will just continue the damage already caused.
by bgnukem
23 Mar 2021, 4:37pm
Forum: Bikes & Bits – Technical section
Topic: Chainsets and BBs
Replies: 16
Views: 782

Re: Chainsets and BBs

They are good value - I've bought 5 of them! Initially Spa were selling them branded as Stronglight Impact, subsequently they have been unbranded sold as 'Spa' chainsets. The finish around the edges of the spider arms has been rougher on the unbranded versions so it might be worth specifically requesting a Stronglight branded version if there's still a choice.

Also IME the basic version (with 2 steel rings and an alloy outer) didn't work well with a 9-speed chain, which got stuck between the outer two 'rings on my bike.
by bgnukem
23 Mar 2021, 4:32pm
Forum: Bikes & Bits – Technical section
Topic: Best wishes for Brucey
Replies: 522
Views: 40347

Re: Has anyone seen Brucey?

Wishing you a speedy recovery Brucey. Your expertise and experience is much valued around here!
by bgnukem
22 Mar 2021, 3:05pm
Forum: Bikes & Bits – Technical section
Topic: 7 speed cassette on 9 speed hub
Replies: 8
Views: 1590

Re: 7 speed cassette on 9 speed hub

All my bikes have 7 sprockets on the back regardless of whether the gearing is 7,8 or 9-speed, with the appropriate spacers used between the sprockets.

Best to buy a set of alloy spacers of various widths for behind the cassette and play around/maybe grind them to the correct thickness, maybe file some slots into one of the thicker spacers if you don't want to remove the cassette bolts. Try to optimise the chainline for the cassette sprockets / chainring combo which you use most often.
by bgnukem
22 Mar 2021, 3:00pm
Forum: Bikes & Bits – Technical section
Topic: Worthwhile upgrade - Conti GP5000?
Replies: 14
Views: 954

Re: Worthwhile upgrade - Conti GP5000?

Only have experience of the Schwalbes in 26 x 1.35" size, so not sure how relevant, but I find the Durano grippy and light and fairly puncture resistant but not that fast rolling. Also had a Rubino Pro 26 x 1.3" too for a while but it would not seat properly on the rim and the rubber perished really quickly.

Have tried Conti GP 4 season and Gatorskins in 700x28. I found lots of punctures occurred with the gators once they were part-worn, while the 4 seasons have been better (only used on the front) but are considerably narrower than the Gators fitted to the same, narrow rim, i.e. 24mm wide whereas the Gators are 26mm, fitted to a 13.5mm internal width rim.

I usually use Panaracer Pasela PTs in 700C for winter riding, they are reasonably light and puncture proof but I'm sure not as fast rolling as the tyres you are considering.
by bgnukem
19 Mar 2021, 2:07pm
Forum: Bikes & Bits – Technical section
Topic: Dynohub rotation direction
Replies: 22
Views: 1429

Re: Dynohub rotation direction

Surely rim brakes won't apply any torque through the spokes to the hub, while clearly all the torque from a disc brake will be transmitted to the hub shell and hence to the spokes and rim.

So clearly fitting a disc-equipped dynamo hub the wrong way around would massively increase the risk of it unscrewing whereas with a rim-brake-specific dynamo the torque would just be from the magnetic drag/bearing drag and so much lower (but still not a good idea).
by bgnukem
18 Mar 2021, 5:26pm
Forum: Bikes & Bits – Technical section
Topic: Campagnolo triple chainset ATB
Replies: 12
Views: 963

Re: Campagnolo triple chainset ATB

If it's new enough to use an ISO tapered axle I'd suggest not using it with a JIS tapered axle (e.g. Shimano and most others such as Sugino/FSA), as the overlap between the cranks and axle will be reduced which weakens the connection, puts more stress on the axle and crankset, might damage the taper inside the crank and potentially (IME) makes it harder to stop creaking noises from the cranks moving around on the axle, etc.

Nice triple, if you can find the correct PCD rings(!)
by bgnukem
18 Mar 2021, 3:41pm
Forum: Bikes & Bits – Technical section
Topic: Why Spa advise against XD-2 for 10 speed set up?
Replies: 15
Views: 1145

Re: Why Spa advise against XD-2 for 10 speed set up?

UpWrong wrote:
bgnukem wrote:I found a 9-speed chain fell between the middle and outer rings of the triple chainset, let alone 10 speed.

Looks like they've finally decided to clarify the issue. I wonder how many people had already had problems?


Interesting you should say that. I've had occasional jamming of the chain between middle and outer rings on 9-speed Spa triple chainsets. I'll check to see what chainset and what rings. Maybe using the TA 9/10/11 speed rings ( marked as such,which are thin) creates a gap the chain can fall into.


The chainset I had issues with had the cheaper 'rings fitted to the basic version, i.e. aluminium alloy outer and I think steel middle and inner rings. It's possible the slightly thinner steel rings could have caused a larger gap between the middle and outer 'rings.

It's now fitted with the better quality Spa zicral rings which may be a little thicker. However, I had the spider arms machined down slightly as well so not sure if this cured the issue or whether the 'rings were responsible.....

With some 'rings the centreline of the teeth can be offset from the centreline of the 'ring thickness, so not all rings are equal regards spacing when mounted to the cranks.
by bgnukem
18 Mar 2021, 3:38pm
Forum: Bikes & Bits – Technical section
Topic: Why Spa advise against XD-2 for 10 speed set up?
Replies: 15
Views: 1145

Re: Why Spa advise against XD-2 for 10 speed set up?

531colin wrote:The guys at Spa fit more chainsets in a week than most people fit in a lifetime.
I realise this might be a rather left-field suggestion for some on this forum, but why not ask Spa?
You could even get to talk to somebody who fits chainsets, rather than somebody whose cousin used to know a bloke who had a chainset once.


Maybe to avoid a bunch of abuse from John, which is what I heard from the backroom when I took my Aubisque frame back to complain about the slipping seatpost.
by bgnukem
17 Mar 2021, 2:14pm
Forum: Bikes & Bits – Technical section
Topic: Why Spa advise against XD-2 for 10 speed set up?
Replies: 15
Views: 1145

Re: Why Spa advise against XD-2 for 10 speed set up?

I found a 9-speed chain fell between the middle and outer rings of the triple chainset, let alone 10 speed.

Looks like they've finally decided to clarify the issue. I wonder how many people had already had problems?
by bgnukem
15 Mar 2021, 1:02pm
Forum: Bikes & Bits – Technical section
Topic: Slipping chain...
Replies: 15
Views: 752

Re: Slipping chain...

Chain checkers often over-rate chain wear as they include wear to the bushings and can indicate 0.5% or more wear in brand new chains, as has been discussed on this forum previously.

Check the chain wear with a ruler, with the chain under tension, measuring between the pin centres. A new chain will have two pins exactly 12" apart. Any more than 1/8" extension would suggest the chain is knackered (1% wear) and has probably worn the cassette beyond being able to be used with a new chain. You might get away with just replacing the most-used/most-worn cassette sprockets and the chain but usually it's not possible to buy individual sprockets any more so unless you have spare cassettes just buy a new one.

You might get away with using the old chainrings as they are typically the longest-lasting part of the transmission, worth a try with a new chain anyway.

There is no 'stretch' as in permanent deformation under load of a chain, it's all just wear to the pins and the inner plates where they pivot on the pins.
by bgnukem
12 Mar 2021, 1:22pm
Forum: Campaigning & Public Policy
Topic: Samye Ling / Eskdalmuir
Replies: 57
Views: 4486

Re: Samye Ling / Eskdalmuir

Signed. The monastery have their reasons for objecting.

From a cycling perspective I'd be more worried about camo-clad wannabe hardmen in 4x4s driving like idiots on the surrounding roads to get to the range.

It is/was a beautiful area for cycling and, living in England now, there are few places in the UK where cycling can be enjoyed in relative peace and quiet.
by bgnukem
12 Mar 2021, 12:37pm
Forum: Bikes & Bits – Technical section
Topic: Valve hole in Exal LX17 Rim
Replies: 9
Views: 511

Re: Valve hole in Exal LX17 Rim

I'd send it back too. Definitely not acceptable.
by bgnukem
11 Mar 2021, 3:28pm
Forum: Bikes & Bits – Technical section
Topic: Worn out Mavic Open Pro. non disc
Replies: 15
Views: 1022

Re: Worn out Mavic Open Pro. non disc

backnotes wrote:I got some new Open Pro C rims last summer. I just measured them and the braking surface is 1.4mm thick without any wear.

They don't make 'em like they used to......though I don't have an NOS Open Pro to compare with.


1.4mm seems about average based on other rims I've measured fitted to my bikes (e.g. H Plus Son Archetype, Ryde Chrina, DRC ST19, Exal LX17). 1.4mm isn't great , but some cheapish Mavics I had a while back (Something like XM117 or 317) were 1mm thick when new, so perhaps a 0.2mm wear allowance!

I've avoided Mavics for a while now....