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Post by Cosmic Wonder on Feb 10, 2019 18:50:22 GMT -5
Just got back from my 19.7 mile ride on my pedal assisted ebike. Yep, I was breathing hard and sweating when I got back. The nice thing about the ebike is the speed of my ride makes it more fun at around 17-22 mph, on the flats, compared to what I would be doing even on a state of the art carbon race bike. At my age a fitness level I think I'd be struggling to keep it at 12-15 mph. Faster is more fun.
Mike
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Post by Fingerplucked on Feb 10, 2019 21:51:14 GMT -5
Mike, what model bike did you get? I know you told me before, but I forgot.
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Post by Cosmic Wonder on Feb 11, 2019 1:30:26 GMT -5
Giant Quick E+ Assist up to 28 mph  Mike |
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Post by jdd2 on Feb 11, 2019 1:33:31 GMT -5
Giant Quick E+ Assist up to 28 mph Mike What kind of valves are on those wheels? Did you need to get a new pump (or adaptor)? |
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Post by Cosmic Wonder on Feb 11, 2019 10:09:20 GMT -5
Presta. I have multiple pumps, bike stands, tools etc from when I was a hard core roadie back a zillion years ago. I did buy a new pump to keep in the desert because most all my stuff is in Portland. The new pump was under 40 bucks from eBay. If it last more than three years it's a good deal. Lots of the new pumps have a two hole head for either presta or schrader. My old stuff you have to take the head apart and reverse the chuck to switch styles.
Mike
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Post by PaulKay on Feb 11, 2019 19:20:17 GMT -5
An interesting thing about these pedal assist schemes is just how complex it is. This Trek bike has 2 or 3 microprocessors. One in the Bosch purion display, and one or two down in the motor casing (the dealer said there was two). A FW update to all three is done periodically by Bosch and you need to bring in the bike to get these updates. When I think about what this technology is doing, it is not that far from a motion control application. I think this bike uses a torque sensor to decide when and how much assistance to provide. So basically a closed loop control system running in real time. So the quality of these bikes would be contingent on well the control system is implemented. I know Bosch is an expert in industrial motion control. So it seems like a natural extension of that expertise. The Bosch system does measure torque, as well as pedal and wheel cadence or rpm’s, over 1000 times a second. The harder you work, the harder the motor works. I have the Class I Bosch system with only 250 watts and 20 mph top speed, vs your 350 watts and 28 mph. Your system may be different, but I find mine has a lag to it. Maybe it’s intentional to make sure the bike doesn’t get away from you. Still, starting from a standstill, it’d be nice if I only had to wait one millisecond before the motor kicked in. I think that may be a feature. I notice little assist from a standstill, but a roation or two on I feel less resistance. |
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Post by TKennedy on Feb 11, 2019 21:34:52 GMT -5
Presta. I have multiple pumps, bike stands, tools etc from when I was a hard core roadie back a zillion years ago. I did buy a new pump to keep in the desert because most all my stuff is in Portland. The new pump was under 40 bucks from eBay. If it last more than three years it's a good deal. Lots of the new pumps have a two hole head for either presta or schrader. My old stuff you have to take the head apart and reverse the chuck to switch styles. Mike Still have an old Silca from the 80's? Betcha ya do  |
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Post by jdd2 on Feb 11, 2019 21:56:29 GMT -5
The ol' silca was indispensable when riding outside of Urbana back in the late 70s/early 80s. It came in handy during interval training.
You know the routine--quietly approach a farm house while gradually building speed, and then go for broke when the dog would light up and start after you. And if it started getting too close, get ready with the pump...!
Rinse and repeat.
(Those modern mini things would be useless.)
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Post by TKennedy on Feb 11, 2019 23:20:53 GMT -5
Yep I knew where all the dogs were. It was bad when the farm was on an uphill grade.
There was one particular dog who seemed to always hang out in front of the farmhouse just waiting for me and he was fast. Once I was out training in the late winter and the ditches were still full of snow. As I blew by his house he came tearing out as usual as I cranked up the speed and it turned out the snow in the ditch was pretty deep and when he hit it he went from 40 to zero in half a second. It was like a cartoon.
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