Originally Posted by
Schwinnsta
Thanks for the info. I notice on your Brompton that you have about an inch above the wheel and frame in the folded position in your picture above. On mine, in the folded position the bottom of the top tube contacts the wheel and so does the bottom tube as well. I am not sure why yours isn't doing that, but it could decrease your folded size.
I don't doubt that Birdy is more comfortable since it can take Big Apple 18 x 50 (it would be nice if Brompton could make a model that could), I just question if I would have problems with bobbing like I do with Moultons.
Another question: Measured from the ground, how high is the handlebar at max extension vertically. I seldom see this in stats for folders. It seems manufactures like to take the max height of riders from the seat post max and assume you will be comfortable with the drop.
I have also two Moulton with the leading link front suspension.
If I had to rate the suspensions of the Birdy vs. the one of the Moulton, I would say that the rear cone suspension with the bottom bracket being part of the rear triangle of the Mouton is better than the one of the Birdy while the front suspension of the Birdy is better than the lading link of the Moulton.
The stem of the Birdy 3 is adjustable in height, there are 5 holes/positions, I never put it at its maximum extension, mine is at the lowest position on the Birdy Touring which is higher than the fixed stem of the Ti Birdy. This lowest position is at about 96cm from the ground and the highest hole 9cm higher, so the highest position should be at about 105cm from the ground. Note that I have a sport 21 degree stem, I do not know if the height is the same on the 10 degree comfort stem ?
Originally Posted by
CEBEP
Thanks foe the info. Do I understand you correctly in a way that XDR body rear hub and Ethirteen made 11s 9-32t cassette will be a direct swap? Or is it a must to change the deraileur too? Can the same spokes be used to rebuild the wheel?
Will this setup will offer similar gear range and values to the Sunrace which comes on R&M and with this setup the cassette will be easier to source when replacing is needed?
Sorry for so many questions but I understand almost nothing in hubs and cassettes.
On the Ti Birdy that had an 11s derailleur, it was a direct swap, there was even no need to readjust the derailleur (the hub is a Hope RS4). On the Birdy Touring that has a 10s derailleur, since all these Ethirteen cassettes are 11s, the derailleur and its shifter must also be changed.
The hub flank have a different diameter, so the spokes must be changed to have the right length.