bosch or kallkoff?

[Deleted member 4366]

Sadly, Atmoshere didn't want to run it this year. It's a shame because the whole event was great fun. We've also lost Redbridge because nobody wanted to organise it.

 

[EddiePJ]

rank amateur unfit, overweight rider

club cyclist Jonathan

Slightly misleading.

I can't ever recall coming across an unfit, overweight club rider, especially one that had been training for an event.

 

[Deleted member 4366]

Read again. Jonathan, the fit club cyclist is in that video on an Emate City. The guy that won the championships on the Emate MTB was overweight and unfit. He's not in the video.

 

[trex]

Why?

Shimano Octalink, Isis, GXP and Hollowtech have been developed to combat the problem of loosened cranks. KMG440 posted this video in another thread:

 

[trex]

Sadly, Atmoshere didn't want to run it this year. It's a shame because the whole event was great fun. We've also lost Redbridge because nobody wanted to organise it.

would you organize it?

 

[nemesis]

At the moment I own a kalkhoff pro connect 2012 model with the Panasonic crank motor and a 2015 focus jarifa 27 with the impulse 2 motor,I have previously owned a kalkhoff with the Bosch motor,for me the top one is easily the impulse 2 motor because it has gear shift assist that is adjustable on the console and also climb assist that is also tuneable,the way it climbs hills is unbelievable and with a 17ah battery the range is superb,second place would be the Panasonic and third Bosch that is also let down for me because of the 11ah battery.

 

[EddiePJ]

would you organize it?

I still like the idea of doing this, but perhaps it could be adapted to test for hill climbing ability as well. http://www.pedelecs.co.uk/forum/threads/battery-bike-range-test.19808/#post-246879

I was over there a couple of weeks ago, and noted that there is a now a weekly hill climbing challenge set up on Wednesday evenings. The guys doing it, were collapsing in a heap at the top.

With the cycle club having a hundred plus members, I reckon that they would jump at the chance to tear the arse off a load of pedelecs. It might even be interesting to see which one fails first. Don't think that I'll offer my bike for it though. My gut feeling is that the Bosch active/performance powered bikes might fail first, even if it's only down to the snapping of a chain. I'd also bet on the Classic line motor holding up better, and without problem.

 

[trex]

for hills, the woosh Krieger would probably be the last one standing.

 

[Deleted member 4366]

for hills, the woosh Krieger would probably be the last one standing.

No crank-drive bike ever won. I think that one of the reasons is because of the gears. The Oxygen MTB with its instant torque pulled out a 10m lead at the beginning of every race, while the crank-drive riders were still trying to find the right gear. That's why I always say that bikes with hub-motors are easier to ride. It really shows in a race like this. The professional/semi-professional riders should have won hands-down, but they lost too muh time through messed-up gear-changes.

Weight is another significant factor. The Oxygen is relatively light, so has a high torque to weight ratio for faster acceleration and higher speed when climbing. I don't know how much it weighs, but you can feel that it's light when you pick it up.

 

[trex]

the track at Redbridge is much longer (3.25km in total) and undulating, Park Street in Bristol is short and steep.
If you test the bike for fastest lap, restricted or derestricted, the bike with the best motor efficiency * gear ratio at high power will be favoured. If you test for the best time over 20 laps, the bike with the best motor efficiency * gear ratio and best BMS will be favoured. If you test for endurance, the bike with the best motor efficiency * battery capacity * gear ratio at low power will be favoured. In all three cases, the Redbridge track favours crank drives and the Krieger has the top specs.

 

[Deleted member 4366]

The bike I built for the Gadget Show that has the same electrical kit as the Oxygen would totally annihilate the Krieger round the Redbridge circuit on speed or distance. Did you see what it did to the Volt at Long Marston? You book the circuit and we'll bring the bike. You on the Krieger and Steve on the Oxydrive. He weighs 110kg too, which should give you a huge advantage, but I would stake more than my reputation on you not winning.

 

[trex]

may be the Boardman with the Oxygen kit is stronger on one lap before the BPM motor gets hot. but I am more about numbers than betting. Still, if someone organises Redbridge, I'd race Steve.
Note to self: will have to find the fastest rolling tyres.

 

[JohnCade]

Have to deregulate it too. Because I believe the Boardman/Oxygen was, and the Volt wasn’t.

 

[trex]

I reckon the bike with the fastest rolling tyres would be favoured and the BPM can't have fast rolling tyres if it needs lots of traction.

 

[rsyme]

Trex,
The bottom of my sDuro Haibike Cross has an isis bracket - it is only some of the Yamahas that have the square one. I put road tyres on the Cross along with mudguards and lights( couldn't get a trekking model!!) and now have 1000Kms in 2 months -- Absolutely brilliant bike in the hills of Co Wexford Ireland. I bought it to replace a Kalkhoff Impulse Ergo which had many issues and I would prefer the Haibike over the Kalkhoff even when the Kalkhoff was perfect.
I find I get about 80Kms from the battery the way I ride it (mostly in Eco mode which is about equal to "Sport" on the Kalkhoff) and this is much the same as the Kalkhoff which is a nominally bigger battery.

Cheers!

Robbie

 

[JohnCade]

I had square tapered BBs on all my road bikes and never had any problems. As long as they’re checked and tightened up regularly they should be good enough for most bikes.

 

[trex]

true enough but there are many who can't take care of maintenance. Better designs solve this sort of problems, reducing maintenance. Plus, square taper has 17mm spindle, Isis, GXP and Holllowtech all have larger spindles.