Search found 1873 matches

by Tigerbiten
22 Sep 2019, 3:19am
Forum: Fun & Games
Topic: When Pi doesn't matter...
Replies: 2
Views: 92

Re: When Pi doesn't matter...

It's because you're mixing metric and imperial units. The tooth pitch is 1/2 inch and you want the diameter in mm. So you need first need to convert inches to mm before dividing by pi. 1 tooth x0.5x25.4/3.14= 4.045 mm. 2 teeth x0.5x25.4/3.14= 8.090 mm. ............. That gives you an increase in dia...
by Tigerbiten
21 Sep 2019, 5:37pm
Forum: Does anyone know … ?
Topic: most aerodynamic/fairingiest handlebar bag or basket?
Replies: 18
Views: 439

Re: most aerodynamic/fairingiest handlebar bag or basket?

my understanding is ............. Rolling resistance has a linear increase with speed. Air resistance has an increase with the square of the speed. And it's around 15 mph where air resistance starts to become really bad. It's a bit lower speed if your on a sit up and beg dutch bike and a bit higher ...
by Tigerbiten
20 Sep 2019, 12:56pm
Forum: Does anyone know … ?
Topic: most aerodynamic/fairingiest handlebar bag or basket?
Replies: 18
Views: 439

Re: most aerodynamic/fairingiest handlebar bag or basket?

Tigerbiten: how does that reconcile with the tested saddlebag being less effective than a bar bag? Completely the wrong shape ...... :D For it to work then it needs to fill in the bodies trailing vortex better. So a tailbox needs to be as long as a rear rack and tapered from the width of your body ...
by Tigerbiten
20 Sep 2019, 11:41am
Forum: Does anyone know … ?
Topic: most aerodynamic/fairingiest handlebar bag or basket?
Replies: 18
Views: 439

Re: most aerodynamic/fairingiest handlebar bag or basket?

I gather that a lot of air resistance is caused by vortex drag. From my reading a good tail box is about twice as effective as a front fairing. A good front fairing smooths the air flowing over the body but still generates a vortex behind it. While a good tailbox which fills in the vortex behind you...
by Tigerbiten
18 Sep 2019, 12:05pm
Forum: Bikes & Bits – Technical section
Topic: Anyone using an 11-speed 11-42t (or similar) with a triple chainset?
Replies: 48
Views: 1723

Re: Anyone using an 11-speed 11-42t (or similar) with a triple chainset?

I'm looking at this from a recumbent trike standpoint where a wide range with an ultra low first gear is reasonably standard. An 11-42 with a triple is well over limits of the range a derailleur setup so you won't get the full benefits from it. If the maximum overall range is 50 teeth then going rou...
by Tigerbiten
18 Sep 2019, 5:48am
Forum: Bikes & Bits – Technical section
Topic: Anyone using an 11-speed 11-42t (or similar) with a triple chainset?
Replies: 48
Views: 1723

Re: Anyone using an 11-speed 11-42t (or similar) with a triple chainset?

As the gears get silly low, not only does it get harder to balance side to side on a bike but the front-back balance gets more critical as well. The lower the gear, the more torque there is trying to lift the front wheel. If you sit to upright on a steep hill in a very low gear then the front wheel ...
by Tigerbiten
16 Sep 2019, 1:39pm
Forum: Non-standard, Human Powered Vehicles
Topic: Removing and refitting rear wheel on bike
Replies: 15
Views: 3196

Re: Removing and refitting rear wheel on bike

No problem ........ :D I only do it that way because I cannot balance my trike upside down. I've extended my front derailleur post by around a foot to support the back of a streamer fairing. While it does also make a good GPS mount, it also removes any flat surface at the front. And at the back I've...
by Tigerbiten
15 Sep 2019, 10:58pm
Forum: Non-standard, Human Powered Vehicles
Topic: Removing and refitting rear wheel on bike
Replies: 15
Views: 3196

Re: Removing and refitting rear wheel on bike

I do it in three operations with my ICE Sprint FS. Balance trike on it's left front wheel. I find this is the easiest side to start the wheel when feeding the chain and chain tensioner around/over the sprocket. Once it's started with the chain in the right place and the disk rotor hits the calliper ...
by Tigerbiten
14 Sep 2019, 5:36pm
Forum: On the road
Topic: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind
Replies: 83
Views: 2371

Re: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind

Signals are a matter of convention or habit. This is one of the reasons for and benefits of the "Two tings please" signs put up by the Canal and Rivers Trust in some places -- it establishes a convention (telling cyclists to ting twice in order to alert other path users of their approach ...
by Tigerbiten
13 Sep 2019, 10:11am
Forum: Does anyone know … ?
Topic: Charging e-bike battery from motor home
Replies: 14
Views: 633

Re: Charging e-bike battery from motor home

Yes but it may not be easy. 1:- Motorhome battery -> Inverter for 240v -> standard mains charger -> E-bike battery. The chain of devices will be probably be horribly inefficient. Even if each step is 80% efficient, only 50% of the power drawn out of one battery ends up in the other. In the very wors...
by Tigerbiten
13 Sep 2019, 3:12am
Forum: On the road
Topic: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind
Replies: 83
Views: 2371

Re: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind

My view is you shouldn't be calling out at all, in exactly the same way when using a bell for passing pedestrians ......... I like to give and receive advanced warning that something different may happen. If it's very quite and I'm cycling along minding my own business and not checking my mirrors w...
by Tigerbiten
12 Sep 2019, 2:51pm
Forum: On the road
Topic: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind
Replies: 83
Views: 2371

Re: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind

3mph is just about walking :roll: I bet these cycle-yobs are going considerably faster. 5-6mph is about right. So are you wanting to fine any runner who goes faster than 5-6 mph as well. If not, why not ?? 10 mph is 1 mile every 6 minutes or 4.3 hours for a marathon. This is over your 5-6 mph limit...
by Tigerbiten
12 Sep 2019, 2:43pm
Forum: On the road
Topic: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind
Replies: 83
Views: 2371

Re: People shouting 'left' 'right' etc on a cylce path whilst approaching from behind

I tend to use "I'm low on your left/right" as needed.
Being on a recumbent probably make me harder to spot if I'm not being looked down upon ........ :D
by Tigerbiten
11 Sep 2019, 6:54pm
Forum: Bikes & Bits – Technical section
Topic: Tandem triple front mech issues
Replies: 15
Views: 596

Re: Tandem triple front mech issues

If I wanted a ridiculously wide gear range on a bike, rather than additional chainrings I'd use a Rohloff hub with the Rohloff chain tensioner and fit two front chainrings. Running 48/38 rings with a 16t cog on the Rohloff would give gears from 120" down to 18". A 56/38 double would give ...
by Tigerbiten
11 Sep 2019, 6:33pm
Forum: Bikes & Bits – Technical section
Topic: Tandem triple front mech issues
Replies: 15
Views: 596

Re: Tandem triple front mech issues

I saw a bike, not a tandem, with four chainrings Is that a thing? It was doable in the past. You needed an adapter which could take a cassette sprocket as the fourth chainring. And then modify the front derailleur so there was more depth to the cage to cope with the greater range. You could more ea...