Search found 90 matches

by Oceanic
22 Dec 2018, 7:17pm
Forum: Bikes & Bits – Technical section
Topic: Road 1X - useful or just a fad?
Replies: 126
Views: 6708

Re: Road 1X - useful or just a fad?

I'm reasonably confident that if a study was done of incidents where cyclists had to stop at the side of the road due to an unshipped chain, the 1x cyclists group would see less incidents than the 2x group.
by Oceanic
22 Dec 2018, 6:09pm
Forum: Bikes & Bits – Technical section
Topic: Road 1X - useful or just a fad?
Replies: 126
Views: 6708

Re: Road 1X - useful or just a fad?

Brucey wrote:When I have used 1x systems the chain has stayed on well enough but one of the problems that the pros saw when they used it was the chain occasionally unshipped which left them in the mire.


Occasional unshipped chains are a feature of pro racing, they happen with 2x systems too.
by Oceanic
21 Dec 2018, 10:56pm
Forum: Bikes & Bits – Technical section
Topic: Road 1X - useful or just a fad?
Replies: 126
Views: 6708

Re: Road 1X - useful or just a fad?

Brucey wrote:I think it is as quick or quicker to dump the chain onto the small ring than it is to make multiple downshifts at the rear. Kinder on the chain too.

cheers


That's assuming that you haven't been forced in to the position of trying to change down while grinding up hill in too big a gear.
by Oceanic
21 Dec 2018, 10:44pm
Forum: Bikes & Bits – Technical section
Topic: Road 1X - useful or just a fad?
Replies: 126
Views: 6708

Re: Road 1X - useful or just a fad?

When most cycling was club runs, a fair chunk of the group knew where they were going, this made it easier to predict when to change to the smaller ring. Now we have GPS and sportives, the following is not uncommon... You are in a group moving down hill at 25mph, you spot a red arrow indicating a tu...
by Oceanic
21 Dec 2018, 9:37pm
Forum: Bikes & Bits – Technical section
Topic: Road 1X - useful or just a fad?
Replies: 126
Views: 6708

Re: Road 1X - useful or just a fad?

Spinners wrote:Ask the poor riders who rode for Team Aqua Blue.


One of the Aqua Blue riders said that 1x was unsuitable for some races, but went on to say 'when I retire, I’ll only ride 1x'.
by Oceanic
13 Oct 2018, 1:34pm
Forum: Bikes & Bits – Technical section
Topic: is it the end of 23mm tyres???
Replies: 127
Views: 4199

Re: is it the end of 23mm tyres???

Of the two bikes I ride regularly, one has a curved carbon fork and feels absolutely fine with a 22mm tyre on the front, the other has a straight carbon fork, and feels unpleasant with anything less than a 25mm tyre on the front. Worth noting also that many of the deep section rims are designed to b...
by Oceanic
29 Jun 2017, 6:36pm
Forum: Bikes & Bits – Technical section
Topic: Who pays 14x as much for an 'equivalent' item? And why?
Replies: 157
Views: 6481

Re: Who pays 14x as much for an 'equivalent' item? And why?

I took the alloy crank arms off my bike and replaced them with a carbon fibre pair that have a retail value of £280. I paid £130 for them in a sale. They are a tiny bit lighter and a tiny bit stiffer. If I swapped back to the old pair I very much doubt that my bike would have any real loss in perfor...
by Oceanic
28 Jun 2017, 5:09pm
Forum: Bikes & Bits – Technical section
Topic: Steerer tube flex and head tube length.
Replies: 9
Views: 795

Re: Steerer tube flex and head tube length.

I just googled and found this article...

https://www.sheldonbrown.com/rinard/rin ... ktest.html

The author is suggesting that longitudinal fork flex in corners affects the bike's handling by altering the rake of the forks.
by Oceanic
28 Jun 2017, 12:25pm
Forum: Bikes & Bits – Technical section
Topic: Steerer tube flex and head tube length.
Replies: 9
Views: 795

Re: Steerer tube flex and head tube length.

What I think is happening is... When we go around a corner centripetal force increases the force exerted by the rider on the road. This force is transferred through the lined up frame and forks. The increased force leads the steerer tube to bend, either between the headset bearings, or between the s...
by Oceanic
27 Jun 2017, 4:29pm
Forum: Bikes & Bits – Technical section
Topic: Steerer tube flex and head tube length.
Replies: 9
Views: 795

Re: Steerer tube flex and head tube length.

I'm using a 130mm headtube. When I had a -6 degree stem on a 28 mm stack of spacers the flex was noticeable. Now I've reduced the spacer stack to 5mm and made up the height difference with a +8 degree stem, the handling problem has gone away. If I bought another frame I would be tempted to go for a ...
by Oceanic
26 Jun 2017, 7:49pm
Forum: Bikes & Bits – Technical section
Topic: Steerer tube flex and head tube length.
Replies: 9
Views: 795

Steerer tube flex and head tube length.

I've noticed that super lightweight forks often have flexible carbon steerer tubes that can affect handling when leaning the bike into corners. Which would have the least steerer tube flex, a short head tube with a 5mm spacer and a +8 degrees stem, or a longer head tube with a 5mm spacer and a -8 de...
by Oceanic
14 Aug 2016, 12:07pm
Forum: Bikes & Bits – Technical section
Topic: Double Chainrings Odd / Even Teeth
Replies: 6
Views: 744

Re: Double Chainrings Odd / Even Teeth

@Spinners - I don't think you can buy 52/39 doubles any more (Edit apart from old stock), maybe their demise is to do with a desire for higher gears rather than a desire for smoother shifting? Off topic but related... Specialities TA say that you should never have a smaller gap than 12 teeth between...
by Oceanic
14 Aug 2016, 10:51am
Forum: Bikes & Bits – Technical section
Topic: Double Chainrings Odd / Even Teeth
Replies: 6
Views: 744

Double Chainrings Odd / Even Teeth

I've noticed that on 'standard' double chainsets, if the inner chainring has an even number of teeth, the outer does too (50/34, 52/36, 46/36, 48/34). Similarly if the inner has an odd number of teeth, the outer does too (53/39). Is this just because of convention? Or do double chainrings shift bett...
by Oceanic
21 Jul 2016, 11:35pm
Forum: Bikes & Bits – Technical section
Topic: Triban 500 forks.
Replies: 2
Views: 625

Re: Triban 500 forks.

In sizes M to XXL the Triban 500 has a head tube angle of 73 deg. This means that you need a fork with a 43mm fork rake. The headset is 1"1/8 , so you need a fork with 1"1/8 steerer. The steerer is not tapered. Sizes M to XXL use 700c wheels. The Triban uses Sora brakes with a 49mm drop. I...
by Oceanic
28 Aug 2014, 2:53pm
Forum: Bikes & Bits – Technical section
Topic: Screw On Freewheels/Chainstay Clearances?
Replies: 5
Views: 519

Re: Screw On Freewheels/Chainstay Clearances?

Does anyone know the overall thickness of 6 speed and 5 speed screw on freewheels? The IRD website gives the following dimensions for their freewheels. 5-spd: 29.2mm, 6-spd: 31.5mm, 7-spd: 34.1mm My options appear to be 6 or 5 speed - and no indexed gearing? My bike has a 5 speed freewheel and Simp...