The minimum speed would be where the centrifugal force given by mv^2/r (m=mass, v= speed, r is radius) balances the weight given by mg (g is acceleration due to gravity)
Rearranging the min speed vmin = sqrt(gr)
Taking the radius as 2.5m snd g=9.8m/s2 gives 4.9m/s or 18km/hr.
Would need to be faster than that to maintain grip at the top of the loop.
Search found 153 matches
- 31 Mar 2023, 6:08pm
- Forum: On the road
- Topic: "Inside Britain's biggest sewer under London's River Thames"
- Replies: 4
- Views: 1102
- 27 Nov 2021, 1:54pm
- Forum: Touring & Expedition
- Topic: Is it too soon to be planning for 2022?
- Replies: 22
- Views: 1767
Re: Is it too soon to be planning for 2022?
Not sure if clear enough to read but here's the map
- 27 Nov 2021, 1:54pm
- Forum: Touring & Expedition
- Topic: Is it too soon to be planning for 2022?
- Replies: 22
- Views: 1767
Re: Is it too soon to be planning for 2022?
Quite a bit of jnfo here: https://avoncycleway.co.uk/ and there's also a facebook group.
I've got a paper map that I picked up in the library years ago, but not sure if it's still available anywhere.
It's a good ride - but the bit near the airport between a370 and a38 is a bit rat runny so best to avoid being on that bit in rush hours.
I've got a paper map that I picked up in the library years ago, but not sure if it's still available anywhere.
It's a good ride - but the bit near the airport between a370 and a38 is a bit rat runny so best to avoid being on that bit in rush hours.
- 26 Nov 2021, 10:24am
- Forum: Touring & Expedition
- Topic: Is it too soon to be planning for 2022?
- Replies: 22
- Views: 1767
Re: Is it too soon to be planning for 2022?
Sadly IIRC Gold Hill has got no cycling signs so recreating the hovis ad might be off... but nonetheless that will be a very nice ride, in fact am currently planning a multiday tour from S Glos with overnight in Shaftsbury having passed through on a previous route.
- 5 Sep 2021, 8:48am
- Forum: Bikes & Bits – Technical section
- Topic: Peddling has become so hard with much vibration
- Replies: 33
- Views: 1982
Re: Peddling has become so hard with much vibration
Yes. Rather than washing, just brush / wipe the sand off with a rag. When oiling, let the oil wick into the chain bearings for a while (overnight if possible) then wipe the chain as dry as possible before riding. Oil is needed where the links pivot - not on the visible surfaces where it will attract sand and grit as the shop say.
- 20 Jul 2021, 8:16pm
- Forum: Bikes & Bits – Technical section
- Topic: Bespoke wheel?
- Replies: 9
- Views: 477
Re: Bespoke wheel?
As a design, it seems a flaw that if one spoke breaks or loses tension then the second, nearby, spoke it's entwined with will also be un-tensioned, doubling the resulting runout.
As a visual effect, very striking though! Thanks for sharing.
As a visual effect, very striking though! Thanks for sharing.
- 30 Jun 2021, 4:00pm
- Forum: Bikes & Bits – Technical section
- Topic: Map case repair
- Replies: 14
- Views: 1024
Re: Map case repair
I used some "fantastic elastic flexible glue" off Amazon for just that job about a year ago and still holding strong.
Was a bit disappointed my expensive ortleib map holder needed it after only 5 or 6 years...
Was a bit disappointed my expensive ortleib map holder needed it after only 5 or 6 years...
- 7 Jun 2021, 7:16pm
- Forum: Bikes & Bits – Technical section
- Topic: Headset Press Disaster
- Replies: 36
- Views: 2313
Re: Headset Press Disaster
If you dismantle the press so far as possible, can you tap one or both heads to then use studding or long bolt to jack the two ends apart? One will pop our first, then knock the second out with a drift.
Another idea might be if the shape allows to use two levers diametrically opposed to pry the press head out against the top of the cups (likely to damage the cups)
Good luck!
Another idea might be if the shape allows to use two levers diametrically opposed to pry the press head out against the top of the cups (likely to damage the cups)
Good luck!
- 27 May 2021, 7:56am
- Forum: Does anyone know … ?
- Topic: Barrier cream question
- Replies: 28
- Views: 2928
Re: Barrier cream question
I use Rozalex Dri Guard barrier cream for dirty/oily jobs where gloves not appropriate (eg when using rotating machinery in which a glove can get caught) and just generally when handling greasy/oily parts in the workshop where gloves would be annoying.
Once finished the worst of the muck rinses off, and cleaning much easier than without using normal household soap bars.
Once finished the worst of the muck rinses off, and cleaning much easier than without using normal household soap bars.
- 22 Apr 2021, 9:14am
- Forum: Bikes & Bits – Technical section
- Topic: Re-aligning bent front forks
- Replies: 3
- Views: 356
Re: Re-aligning bent front forks
Assuming Malborough Wilts Argos Racing Cycles in Bristol is probably a good bet.
- 9 Apr 2021, 1:27pm
- Forum: Family Cycling
- Topic: Teaching children to ride on the road
- Replies: 3
- Views: 5530
Re: Teaching children to ride on the road
Very good advice. If you have one, a talk through manoeuvres on one of those road playmats with a toy car/bike can explain things quite easily.ClappedOut wrote: ↑30 Mar 2021, 9:56pm
What I'm saying is teach them what will be expected and in advance.
Another thing is check they know their left & right! I'd not realised that our eldest has a bit of a block on this so after some confusion I started using "bell side" and "gear side" as more reliable.
- 9 Apr 2021, 1:11pm
- Forum: Does anyone know … ?
- Topic: Best Bike For Beginner?
- Replies: 64
- Views: 2857
Re: Help Of Choosing Correct Frame Size (Road Bike)
In simple terms, it's about trading two/three parameters:
1) saddle setback
This is how far the saddle is behind the bottom bracket (crank bearing).
Further back = less weight on hands, further forward = more racy. Too far forward for your type of riding will put excessive weight on hands leading to aches & pains.
2) height of, and distance to the handlebars
Typically closer to saddle and higher for leisure riding, lower and further away for a "racy fit".
You want the height and reach to be such that.you can use the drops comfortably - this then gives the most usable positions.
As.others have said what.dimensions achieve these vary depending on fitness, flexibility and core strength. Friends of mine are happy touring in a position I'd struggle to hold for a 10 min sprint whereas others might struggle to adopt even my position.
If you are unsure, find a bike that feels comfortable set up so you could move all the above either way - gives you options.
People often don't commute on 'best' bikes as they may have drivetrains that are more expensive and/or susceptible to wear, may have fast rolling, rather than robust, tyres, and perhaps no mudguards or rack - which most (but by no means all) will want for commuting.
The main thing is to get riding and enjoy it!
1) saddle setback
This is how far the saddle is behind the bottom bracket (crank bearing).
Further back = less weight on hands, further forward = more racy. Too far forward for your type of riding will put excessive weight on hands leading to aches & pains.
2) height of, and distance to the handlebars
Typically closer to saddle and higher for leisure riding, lower and further away for a "racy fit".
You want the height and reach to be such that.you can use the drops comfortably - this then gives the most usable positions.
As.others have said what.dimensions achieve these vary depending on fitness, flexibility and core strength. Friends of mine are happy touring in a position I'd struggle to hold for a 10 min sprint whereas others might struggle to adopt even my position.
If you are unsure, find a bike that feels comfortable set up so you could move all the above either way - gives you options.
People often don't commute on 'best' bikes as they may have drivetrains that are more expensive and/or susceptible to wear, may have fast rolling, rather than robust, tyres, and perhaps no mudguards or rack - which most (but by no means all) will want for commuting.
The main thing is to get riding and enjoy it!
- 24 Mar 2021, 8:02am
- Forum: Bikes & Bits – Technical section
- Topic: Best wishes for Brucey
- Replies: 613
- Views: 73463
Re: Best wishes for Brucey
Best wishes Brucey.
I'm not a frequent poster, but have gained much useful info from the back catalogue of posts.
I'm not a frequent poster, but have gained much useful info from the back catalogue of posts.
- 8 Mar 2021, 5:45pm
- Forum: Bikes & Bits – Technical section
- Topic: Child seat voiding frame warranty
- Replies: 41
- Views: 2012
Re: Child seat voiding frame warranty
Thorn quote max loadings for front & rear panniers, but not sure about more "mainstream" makes...
- 24 Feb 2021, 7:08pm
- Forum: Family Cycling
- Topic: Cycling with a 9 month old & bike attachment for older child
- Replies: 21
- Views: 8981
Re: Cycling with a 9 month old & bike attachment for older child
Jdsk wrote:martinn wrote:I have used a trail gator, a tag along, and a follow me. The follow me is massively superior to the tag along, which is superior to the trail gator, in terms of stability, in my experience, but we are all different.
Thanks.
I've often wondered how they compare, but never before heard from anyone who has tried them all.
Jonathan
We.used a follow me: worked well for me, and advantage of being seperable, but my wife always found it made her bike very unstable - I think because it's a ladies frame with reduced torsional stiffness.
Also had good experience with a "weehoo" and a "weehoo copilot" - would recommend both.