Motorized Bicycle Engine Kit Forum  


Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle > Motorized Bicycle General Discussion

Motorized Bicycle General Discussion All topics regarding bicycles with engines.

Thread Tools Display Modes
Old 12-19-2008, 08:01 PM
Heemlo Heemlo is offline
Motorized Bicycle Newbie
Join Date: Nov 2008
Location: New Jersey
Posts: 8
Default speedhub 100Nm limit

I think the speedhub would work really well for gearing, but I notice they specify a torque input limit of 100Nm. I'm a little unsure of how to figure out what this means in terms of engine power limit. According to my calculations, with a 20inch wheel, and max power at 15mph, hp limit is about 3.8. Am I correct? A little help here? I'm not sure how much hp the ht's make either, but this would mean the morini s6-t would be too powerful.

edit: actually I think I messed up with calculations my new hp limit is 13.6, is this correct lol?

Last edited by Heemlo; 12-19-2008 at 08:22 PM.
Reply With Quote
Old 12-20-2008, 12:51 AM
Technocyclist's Avatar
Technocyclist Technocyclist is offline
Motorized Bicycle Senior Technologist
Join Date: Jul 2008
Location: Asia
Posts: 463
Default Re: speedhub 100Nm limit

are you referring to an internal gear hub? I have an 8-speed internal gear hub on a 26" wheel. I did'nt made any calculations like you did. I just installed and fire away... I don't think the HT engine can ruin the internal gear hub as long as the sprockets are geared properly.
Regardless if it's left or wrong, the opposite is always right.

Caution: This hobby is habit forming.
Reply With Quote
Old 12-20-2008, 10:08 AM
mabman mabman is offline
Motorized Bicycle Elite Member
Join Date: Oct 2008
Location: In the wind
Posts: 258
Default Re: speedhub 100Nm limit

The Rohloff hub is a nice piece of work but you can buy 3 Nuvinci hubs for the same price as one speedhub. I also have a 20" rear wheel and searched around and got a complete sachs 3x7 hub/front wheel takeoff from a new bike on fleabay for $250. Talk about some gear range! The Shimano Nexus 8 is supposed to be reliable also. There are plenty of options out there, but the trick to internal hubs is in how you shift them. If you shift under too much load they will implode, just back off the gas a bit while shifting and you will be fine, even with an old 3 speed model.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 05:50 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, vBulletin Solutions, Inc.