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Search: Posts Made By: Jipe
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Forum: Folding Bikes
04-07-24, 10:06 AM
Replies: 44
Views: 3,753
Posted By Jipe

If you mean ETRTO406 for 20", the best trade off...

If you mean ETRTO406 for 20", the best trade off currently are the Continental Contact Urban, there are 3 width available, 32x406, 42x406 and 50x406:
- low rolling resistance.
- pretty high...
Forum: Folding Bikes
04-07-24, 01:28 AM
Replies: 44
Views: 3,753
Posted By Jipe

The Verge is the model that had the biggest...

The Verge is the model that had the biggest problem of broken frames, it was not some isolated bad welded frames, the recall cover bikes produced during more than 4 year (January 2012 to April 2016),...
Forum: Folding Bikes
04-03-24, 03:36 PM
Replies: 2,948
Views: 1,020,188
Posted By Jipe

The use of a BWR IGH (heavy, low efficiency, slow...

The use of a BWR IGH (heavy, low efficiency, slow gear changes, inertia...) on the T-line is a nonsense!

This bike should have a real 11s cassette + real derailleur just like Helix.

For the...
Forum: Folding Bikes
04-02-24, 09:53 AM
Replies: 44
Views: 3,753
Posted By Jipe

For the behavior of a bike on rough surfaces and...

For the behavior of a bike on rough surfaces and bad roads (cobbles, potholes...), what is important is the relative overall wheel diameter difference, some values:
- Road bike 28x622 about 678mm
-...
Forum: Folding Bikes
04-02-24, 07:26 AM
Replies: 44
Views: 3,753
Posted By Jipe

Verge X11: ETRTO451x28 overall diameter about...

Verge X11: ETRTO451x28 overall diameter about 451+(2*28) = 507mm
T-line: ETRTO349x35, overall diameter about 349+(2*35) = 419mm

Difference -88mm = -3.46 inches = 17% smaller.

An aluminum...
Forum: Folding Bikes
04-02-24, 04:04 AM
Replies: 47
Views: 35,341
Posted By Jipe

Found out that this old news about Tern recall...

Found out that this old news about Tern recall was still online: (https://www.bicycleretailer.com/recalls/2016/04/26/tern-expands-recall-some-bikes-over-frame-concerns#.Vx_nWt8pDqA)
Forum: Folding Bikes
04-01-24, 11:50 PM
Replies: 2,948
Views: 1,020,188
Posted By Jipe

About the rear rack: - On the Brompton, the...

About the rear rack:
- On the Brompton, the rear rack use is very limited because anything wider than the rack will be hit with the heels while pedaling, so its not compatible with rear pannier. ...
Forum: Folding Bikes
04-01-24, 09:19 AM
Replies: 2,948
Views: 1,020,188
Posted By Jipe

A Riese & Müller Birdy 3 Touring with 10s...

A Riese & Müller Birdy 3 Touring with 10s derailleur will be faster than the T-line and as fast than Helix but much more comfortable due to its 50mm wide tires and full suspension (it rides also...
Forum: Folding Bikes
04-01-24, 05:15 AM
Replies: 2,948
Views: 1,020,188
Posted By Jipe

I didn't mention comfort in the drawback of the...

I didn't mention comfort in the drawback of the T-line and Helix because both have this problem: both have relatively narrow tires (35mm for the T-line, the frame should accept 40mm but there is only...
Forum: Folding Bikes
04-01-24, 04:03 AM
Replies: 2,948
Views: 1,020,188
Posted By Jipe

These two bikes are very different, both have...

These two bikes are very different, both have strong points and weaknesses:
- T-line is really lightweight, it weight much less than Helix Ultralight. Helix, even the Ultralight, is an heavy bike...
Forum: Folding Bikes
03-31-24, 04:19 PM
Replies: 61
Views: 7,343
Posted By Jipe

Tern, the bike manufacturer, officially...

Tern, the bike manufacturer, officially recognized the manufacturing problem and issued a bike recall (there were explanations about that recall on the Tern website but theses pages were removed),...
Forum: Folding Bikes
03-31-24, 03:58 PM
Replies: 61
Views: 7,343
Posted By Jipe

Several Tern models of these years (the used one...

Several Tern models of these years (the used one for which the discussion was started was from 2013), including the X30, had a manufacturing problem (and maybe a design problem) that was eventually...
Forum: Folding Bikes
03-27-24, 04:18 AM
Replies: 144
Views: 5,163
Posted By Jipe

I agree with you, what is important is that a...

I agree with you, what is important is that a bike fits your needs and provides riding pleasure.

The price has no importance unless whats make you happy is not riding your bike but having the...
Forum: Folding Bikes
03-01-24, 12:58 AM
Replies: 76
Views: 43,964
Posted By Jipe

This way of mounting on the head tube won't work...

This way of mounting on the head tube won't work with frames like the Birdy and Zizzo with a big main tube that cover most of the length of the head tube.

My experience from building several own...
Forum: Folding Bikes
02-28-24, 03:15 AM
Replies: 45
Views: 1,937
Posted By Jipe

I looked at the website you gave. I do not...

I looked at the website you gave.

I do not think that the problem is rain and humidity.

I also live in a rainy place, and even if I do not like the Brompton Sturmey Archer IGH, they are really...
Forum: Folding Bikes
02-22-24, 03:02 AM
Replies: 25
Views: 1,575
Posted By Jipe

I do not see for what kind of real off road this...

I do not see for what kind of real off road this bike will be better than the GSD:
- for muddy trails, the mudguards are much too close to the tires and will quickly be full of mud, blocking the...
Forum: Folding Bikes
02-17-24, 06:22 AM
Replies: 11
Views: 547
Posted By Jipe

Brompton mount Schrader valve tubes.

Brompton mount Schrader valve tubes.
Forum: Folding Bikes
02-15-24, 06:43 AM
Replies: 2,423
Views: 723,446
Posted By Jipe

If you don't know it, the Birdy front disc brake...

If you don't know it, the Birdy front disc brake is on the right side of the bike (to allow a more compact fold) and its position WRT. the center of the front hub is not standard (the distqnce...
Forum: Folding Bikes
02-09-24, 04:40 AM
Replies: 127
Views: 4,678
Posted By Jipe

So this bike previously claimed to be the perfect...

So this bike previously claimed to be the perfect folding bike compared to the crap Swift, suddenly requires a re-design?

Actually, the reason why the Fsir Spin (and several others folding bikes)...
Forum: Folding Bikes
02-08-24, 04:50 PM
Replies: 127
Views: 4,678
Posted By Jipe

In 2015, a Dutch company tried to sell the Fsir...

In 2015, a Dutch company tried to sell the Fsir Spin in The Netherlands, it was a total failure but understandable when you see how an average dutch guy sits on a Fsir Spin!
...
Forum: Folding Bikes
02-08-24, 12:44 AM
Replies: 118
Views: 5,935
Posted By Jipe

I agree with you that a front bag is very useful....

I agree with you that a front bag is very useful.

9 gears instead of 6 gears is an advantage since it has no influence on the folded width (BTW, its the same for the Brompton: enlarging the rear...
Forum: Folding Bikes
02-07-24, 06:58 AM
Replies: 127
Views: 4,678
Posted By Jipe

The drawback of the Swift is its bigger folding...

The drawback of the Swift is its bigger folding size.
Forum: Folding Bikes
02-02-24, 04:25 AM
Replies: 118
Views: 5,935
Posted By Jipe

For technical reasons I do not recommend these...

For technical reasons I do not recommend these aluminum blocks!

The Brompton block in industrial plastic is much wider than the threaded rod brazed on the bike head tube and its material has some...
Forum: Folding Bikes
02-01-24, 03:19 AM
Replies: 118
Views: 5,935
Posted By Jipe

Grease, dirt, shocks exist all over the world (at...

Grease, dirt, shocks exist all over the world (at least for bike that really ride, those who have a chain)!
Forum: Folding Bikes
01-31-24, 12:09 AM
Replies: 118
Views: 5,935
Posted By Jipe

More than 16t difference between chainrings...

More than 16t difference between chainrings doesn't work well with most front derailleur.

With a very big chainring, such a big difference in teeth is necessary to have a big enough difference in...
Forum: Folding Bikes
01-25-24, 04:53 AM
Replies: 13
Views: 500
Posted By Jipe

Why not just (let) rebuild the wheels with new...

Why not just (let) rebuild the wheels with new high quality spokes?

It will be a better, more reliable solution than a cheap wheelset found on Aliexpress built with unknown quality components.
Forum: Folding Bikes
01-23-24, 10:04 PM
Replies: 1
Views: 228
Posted By Jipe

My Titanium Birdy with 20" wheels: ...

My Titanium Birdy with 20" wheels:

https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1504/birdy20_r1ac_65697323d24f2378788b0bd4c6a5b5c06707748b.jpg
Tyrell XF:
...
Forum: Folding Bikes
01-23-24, 09:48 PM
Replies: 100
Views: 8,567
Posted By Jipe

Like for the other transmissions, 2s, 4s, 6s,...

Like for the other transmissions, 2s, 4s, 6s, there are several sizes of chainring for the 12s between which the customer can choose while ordering its bike. the error can be the text saying that...
Forum: Folding Bikes
01-11-24, 10:21 AM
Replies: 50
Views: 6,230
Posted By Jipe

No, as said, for all Moulton with 20" wheels, the...

No, as said, for all Moulton with 20" wheels, the pedalstroke doesn't compress the suspension because the bottom bracket is part of the rear triangle the chain traction when pedaling doesn't interact...
Forum: Folding Bikes
01-11-24, 07:16 AM
Replies: 100
Views: 8,567
Posted By Jipe

Yes, a 3 speed IGH is more efficient than most...

Yes, a 3 speed IGH is more efficient than most IGH with more gears.

But not than a derailleur only solution.

The problem remains that Brompton, for any reason; doesn't want to make a 135mm OLD...
Forum: Folding Bikes
01-02-24, 12:58 AM
Replies: 35
Views: 4,003
Posted By Jipe

If you experience rust problems on bike parts due...

If you experience rust problems on bike parts due to being by the sea, one product that's not developed for bike but works pretty well and penetrate where grease doesn't go:
...
Forum: Folding Bikes
12-15-23, 04:27 PM
Replies: 1,504
Views: 441,948
Posted By Jipe

With mudguard, up to 50x355. Its the factory tire...

With mudguard, up to 50x355. Its the factory tire size of the Birdy Rohloff.

Without, there is the Vee Tire Co Crown Gem 54x355 MTB tire.

And the bike has a full front+rear suspension.

I use...
Forum: Folding Bikes
12-15-23, 08:00 AM
Replies: 1,504
Views: 441,948
Posted By Jipe

II hope you didn't get hurt ? Such wooden...

II hope you didn't get hurt ?

Such wooden bridges are often very slippery in the winter.

Such trails fits also very well for the Birdy.
Forum: Folding Bikes
12-07-23, 09:44 AM
Replies: 100
Views: 8,567
Posted By Jipe

The issue is not ETRTO349 or ETRTO355, there is...

The issue is not ETRTO349 or ETRTO355, there is only 6mm difference !

The issue is the tire clearance on the Brompton frame that limit the tire width to about 37mm (no space in tire width and tire...
Forum: Folding Bikes
12-04-23, 08:54 AM
Replies: 32
Views: 1,779
Posted By Jipe

The combination of a shoulder strap and a clean...

The combination of a shoulder strap and a clean rectangular parallelepiped folded shape is the easiest to carry. If is lightweight, its even better.

The Brompton (+ clones, Dahon Curl...) and the...
Forum: Folding Bikes
12-03-23, 02:32 AM
Replies: 17
Views: 1,139
Posted By Jipe

Its clear that Capreo is now obsolete and that...

Its clear that Capreo is now obsolete and that this announcement is only for people having a Capreo equipped bike and need to replace their cassette.

For people needing high enough gear inches on...
Forum: Folding Bikes
12-02-23, 05:03 PM
Replies: 17
Views: 1,139
Posted By Jipe

Because on small wheel bikes, to have high enough...

Because on small wheel bikes, to have high enough gear inches with a cassette+derailleur transmission (not an IGH), there are only two choices:
- either use a very big chainring.
- either use a...
Forum: Folding Bikes
12-02-23, 05:49 AM
Replies: 32
Views: 1,779
Posted By Jipe

Most scooters are heavier than folding bikes and...

Most scooters are heavier than folding bikes and have a limited range (don't trust what manufacturers claim, in real use, they do much less km/miles than claimed).

Folding bike manufacturers often...
Forum: Folding Bikes
11-24-23, 03:20 AM
Replies: 38
Views: 3,239
Posted By Jipe

The first thing is up to you to know if a bifold...

The first thing is up to you to know if a bifold that folds much bigger than a Brompton and is much less easy to carry fits for your needs.

If its fit, making a choice between the many...
Forum: Folding Bikes
11-22-23, 06:43 AM
Replies: 2,948
Views: 1,020,188
Posted By Jipe

For those interested (and confident in) Helix, I...

For those interested (and confident in) Helix, I got a mail announcing sales on the Alfine 11 Helix + no shipment costs and duties for many countries (Europe, Australia, New Zealand, Japan, South...
Forum: Folding Bikes
11-20-23, 10:23 AM
Replies: 91
Views: 7,532
Posted By Jipe

The bike frame is really beautifully built, its...

The bike frame is really beautifully built, its gorgeous !

The stem that bends forward is not a problem, its the same on the Birdy with 21 degree sport stem and the Birdy isn't twitchy at all,...
Forum: Folding Bikes
11-19-23, 12:23 PM
Replies: 91
Views: 7,532
Posted By Jipe

Very interesting, I never saw any feedback about...

Very interesting, I never saw any feedback about this Burke 20.

I wonder how comfortable it is on bad roads, since its frame seems very stiff, without any suspension and with relatively narrow...
Forum: Folding Bikes
11-18-23, 06:28 AM
Replies: 91
Views: 7,532
Posted By Jipe

This Burke 20 is supposed to be available since...

This Burke 20 is supposed to be available since many years.

Specs were excellent (even if some design choices like narrow 35mm tires, V-brakes are now a little obsolete), the folded bike should...
Forum: Folding Bikes
11-16-23, 10:09 AM
Replies: 91
Views: 7,532
Posted By Jipe

Grade 5 is indeed stiffer than grade 9 but its...

Grade 5 is indeed stiffer than grade 9 but its mechanical properties aren't the same as the steel used for the Brompton steel frame.

The reason why frame manufacturers usually do not use grade 5...
Forum: Folding Bikes
11-16-23, 05:53 AM
Replies: 91
Views: 7,532
Posted By Jipe

I fully agree with you. Brompton redesigned...

I fully agree with you.

Brompton redesigned the Ti frame to take into account the different mechanical properties of titanium vs. steel and this resulted in a frame with tube with a significantly...
Forum: Folding Bikes
11-09-23, 03:00 PM
Replies: 91
Views: 7,532
Posted By Jipe

I fully agree with you wrt. the finely...

I fully agree with you wrt. the finely controllable modulation of discs but not all of them: I only had this with the several hydraulic disc brakes I have/had (Shimano Deore, XT, Magura Louise, MT4,...
Forum: Folding Bikes
11-08-23, 04:01 PM
Forum: Folding Bikes
10-25-23, 09:55 PM
Replies: 28
Views: 2,118
Posted By Jipe

The derailleur of the Brompton is not a...

The derailleur of the Brompton is not a derailleur that hang under the left base like a usual derailleur, its a kind of small fork, there is no risk to hit and damage it.

The weak points of the...
Forum: Folding Bikes
10-09-23, 10:46 PM
Replies: 127
Views: 31,924
Posted By Jipe

From my experience of riding small wheel bikes,...

From my experience of riding small wheel bikes, Brompton, Birdy, Moulton, Tern GSD and also a Hase Pino semi-recumbent tandem with a 55x406 front wheel, the only situation in which a small wheel is a...
Forum: Folding Bikes
09-29-23, 01:22 AM
Replies: 1,504
Views: 441,948
Posted By Jipe

To be fast, what make the difference is not 45mm...

To be fast, what make the difference is not 45mm overall wheel size difference between ETRTO451 and ETRTO406 (about 8% with 28mm wide tires) but the tires rolling resistance, 28x406 Pro-one on high...
Showing results 1 to 50 of 211
 


 
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