What if you've already got a good bike but would like to add a bit of electric assistance? Enter the Gruber Assist, a new retrofit ebike system that fits into any standard 31.6mm seatpost. A small electric motor slides into the seat tube and engages with a geared bottom bracket to add 200 Watts of assistance when needed.
The entire Gruber Assist system weighs just 900 grams including a nickel metal hydride battery pack with enough juice to provide up to 1.5 hours of assisted pedaling. An even lighter lithium ion pack is also available. The price may be a little steep at £1649 (about $2,473 in U.S. funds), but the technology is undeniably cool.
[Source: Gruber Assist via Gizmag]