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Search: Posts Made By: Jipe
Showing results 1 to 50 of 1000
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Forum: Folding Bikes
05-19-24, 10:26 AM
Replies: 47
Views: 6,301
Posted By Jipe

Compare the shape of the Ultegra and the shape of...

Compare the shape of the Ultegra and the shape of the Zee: the Ultegra body is never very much tilted to the ground it is slightly tilted to the ground only when the chain is on the biggest cogs and...
Forum: Folding Bikes
05-19-24, 06:39 AM
Replies: 47
Views: 6,301
Posted By Jipe

The cage length alone doesn't define how low the...

The cage length alone doesn't define how low the derailleur cage goes.

The way the whole derailleur, body+cage, stretch is also important. Shimano improved the geometry of the recent rear...
Forum: Folding Bikes
05-19-24, 01:01 AM
Replies: 47
Views: 6,301
Posted By Jipe

These two pictures show that the derailleur cage...

These two pictures show that the derailleur cage obviously hit something.

Even if its a short cage, this derailleur with this big cog cassette and 50x305 wheels comes really close to the ground.
...
Forum: Folding Bikes
05-16-24, 10:31 PM
Replies: 4,036
Views: 946,172
Posted By Jipe

Seems a lot of work to dismount and remount the...

Seems a lot of work to dismount and remount the bike to put it in this suitcase, how long does it take to do it?
Forum: Folding Bikes
05-16-24, 02:49 AM
Replies: 16
Views: 494
Posted By Jipe

No, there are efficient mudguards front and rear....

No, there are efficient mudguards front and rear.

We often ride in muddy trails without dirty pants+shoes.
Forum: Folding Bikes
05-15-24, 03:43 PM
Replies: 7
Views: 1,443
Posted By Jipe

Moving from 60 to 61 or even 62t won't change a...

Moving from 60 to 61 or even 62t won't change a lot, 1.66% or 3.33%.

But moving from 12 to 11 will increase the gear inch by 8.3% which is a bigger increase.

BTW, you can do both!

For the...
Forum: Folding Bikes
05-15-24, 10:30 AM
Replies: 7
Views: 413
Posted By Jipe

This announcement of a new plant was made early...

This announcement of a new plant was made early 2022 before the T-line was released, it had nothing to do with an aluminum frame Brompton intended to solve the problem of the too high price of the...
Forum: Folding Bikes
05-15-24, 06:06 AM
Replies: 7
Views: 413
Posted By Jipe

What is sure is that currently, Brompton factory...

What is sure is that currently, Brompton factory has no in house aluminum frame manufacturing capabilities (nor in house aluminum frame design knowledge), unless they build up a brand new production...
Forum: Folding Bikes
05-15-24, 05:02 AM
Replies: 8
Views: 339
Posted By Jipe

The baseline of the ORI design is to have a...

The baseline of the ORI design is to have a single piece frame without the center hinge of the bifold design which is a known weak point of the bifold design.

To reduce the folded length, the...
Forum: Folding Bikes
05-12-24, 01:25 AM
Replies: 16
Views: 494
Posted By Jipe

Yes, absolutely, the bike will behave perfectly...

Yes, absolutely, the bike will behave perfectly well with captain and stoker with equal weight.

The bike wasn't designed with a weight difference between captain and stoker in mind.

Due to the...
Forum: Folding Bikes
05-11-24, 03:52 PM
Replies: 19
Views: 634
Posted By Jipe

Its 910mm, I rounded it down a little and the...

Its 910mm, I rounded it down a little and the chainstay is 347mm, I rounded it up a little, source: https://handsonbike.blogspot.com/2021/01/fnhon-gust-bike-geometry.html for the size of the cyclist,...
Forum: Folding Bikes
05-11-24, 03:21 PM
Replies: 16
Views: 494
Posted By Jipe

The sum of your both weight is far below the max...

The sum of your both weight is far below the max allowed weight of 496lbs of the Pino and the rear captain must not be heavier or taller than the front stoker, example with the previous version....
Forum: Folding Bikes
05-11-24, 10:24 AM
Replies: 19
Views: 634
Posted By Jipe

Your favorite Fnhon Gust has a very short...

Your favorite Fnhon Gust has a very short wheelbase of only 900mm! Much shorter than a road bike, much shorter than the Brompton and Birdy who have almost the same wheelbase.

Its chainstay length...
Forum: Folding Bikes
05-11-24, 09:39 AM
Replies: 16
Views: 494
Posted By Jipe

We have a Hase Pino semi-recumbent tandem, its...

We have a Hase Pino semi-recumbent tandem, its really gorgeous: both cyclist have a perfect front view instead of having the rear one having the back of the front cyclist in front of her/him....
Forum: Folding Bikes
05-11-24, 03:41 AM
Replies: 19
Views: 634
Posted By Jipe

The Birdy is not a MTB nor a gravel bike. ...

The Birdy is not a MTB nor a gravel bike.

Its suspension is designed to be used on paved roads and it rides fast and comfortably on bad paved roads including cobbles on which small wheels bike...
Forum: Folding Bikes
05-10-24, 10:01 AM
Replies: 19
Views: 634
Posted By Jipe

The front suspension of the Birdy works better...

The front suspension of the Birdy works better than the front Leading Link of several Moulton (I never tried the front suspension of the New Series which by the way has several variant).

As said,...
Forum: Folding Bikes
05-10-24, 03:49 AM
Replies: 19
Views: 634
Posted By Jipe

Due to its specific geometry, the front...

Due to its specific geometry, the front suspension of the Birdy doesn't dive when braking or bob when pedaling.

The rear suspension is classic but with a pivot well positioned, much better than on...
Forum: Folding Bikes
05-09-24, 03:41 PM
Replies: 19
Views: 634
Posted By Jipe

These 3 bikes are very different! First the...

These 3 bikes are very different!

First the Dahon MU P24 is very similar to your Tern Link P9, its heavier, the 3 speed rear hub is heavy and has a lower efficiency than a derailleur only...
Forum: Folding Bikes
05-08-24, 02:50 AM
Replies: 18
Views: 9,848
Posted By Jipe

When reading your old post saying that there were...

When reading your old post saying that there were no small wheel high performances non folding bikes and because you are in Japan, I was immediately thinking at the beautiful Tyrell non folding bikes...
Forum: Folding Bikes
05-03-24, 01:41 AM
Replies: 3
Views: 435
Posted By Jipe

Its almost impossible to answer your questions...

Its almost impossible to answer your questions without having this bike!

For the rear folding rack, the two required mounting points are present (hole on the main frame in front of the seatpost,...
Forum: Folding Bikes
05-01-24, 10:18 AM
Replies: 41
Views: 1,734
Posted By Jipe

If you look at rim and wheel specifications given...

If you look at rim and wheel specifications given by the rim and wheel manufacturers, they also give a range of tires width that fit on their rim and wheels with a minimum and a maximum allowed...
Forum: Folding Bikes
05-01-24, 04:46 AM
Replies: 3
Views: 435
Posted By Jipe

The frame looks like a copy of the Birdy 2, not...

The frame looks like a copy of the Birdy 2, not the current Birdy 3.

The folding is similar to the Birdy 2 folding.

Even if the Birdy 2 and Birdy 3 seem very similar, its not the case, the two...
Forum: Folding Bikes
04-30-24, 07:23 AM
Replies: 41
Views: 1,734
Posted By Jipe

This table is an ISO recommendation defined by a...

This table is an ISO recommendation defined by a committee of experts.

As always for such recommendations, the value have been chosen to be safe in the worst case, i.e. worst case for tire...
Forum: Folding Bikes
04-29-24, 03:40 PM
Replies: 41
Views: 1,734
Posted By Jipe

Indeed, the narrow rim changes the tire profile...

Indeed, the narrow rim changes the tire profile to a round shape.

If the rim is really narrow, this round shape only rest on the rim on a small part of the round and when cornering, there is big...
Forum: Folding Bikes
04-29-24, 10:00 AM
Replies: 41
Views: 1,734
Posted By Jipe

The ETRTO table is and ISO standardized table...

The ETRTO table is and ISO standardized table defined by a panel of experts.
Forum: Folding Bikes
04-29-24, 03:17 AM
Replies: 41
Views: 1,734
Posted By Jipe

Anyway, the narrow tires were chosen due to lower...

Anyway, the narrow tires were chosen due to lower aerodynamic resistance but bike manufacturers discovered that a wide tire with a matched wide rim provides an as good aerodynamics, so no reason...
Forum: Folding Bikes
04-28-24, 03:41 PM
Replies: 41
Views: 1,734
Posted By Jipe

Schwalbe has a table with the recommended tire...

Schwalbe has a table with the recommended tire width in function of the inner rim width, its an extension of the ETRTO table but it starts at 15mm inner rim width, 14 is not in the table!

Ultra...
Forum: Folding Bikes
04-28-24, 09:57 AM
Replies: 41
Views: 1,734
Posted By Jipe

Often, race rims like the one on these race...

Often, race rims like the one on these race oriented wheels with very few spokes are narrow and do not allow wide tires (I do not see any reason to put so few spokes on a folding bike wheel, the...
Forum: Folding Bikes
04-26-24, 03:38 PM
Replies: 58
Views: 5,539
Posted By Jipe

Look at the Birdy!

Look at the Birdy!
Forum: Folding Bikes
04-23-24, 10:29 AM
Replies: 90
Views: 33,332
Posted By Jipe

The NS Speed has normally a one piece frame (but...

The NS Speed has normally a one piece frame (but there were special editions with a separable frame) its more sport oriented and weight less than the Double Pylon which is more a touring bike.

The...
Forum: Folding Bikes
04-18-24, 02:20 AM
Replies: 21
Views: 1,408
Posted By Jipe

I have a Moulton Jubilee that also splits into...

I have a Moulton Jubilee that also splits into two parts.

Its easy to do split but the two parts are really big, the only solution to make it smaller is to remove the wheels but when doing so, the...
Forum: Folding Bikes
04-12-24, 02:15 AM
Replies: 58
Views: 5,539
Posted By Jipe

Continental has excellent fast new tires with...

Continental has excellent fast new tires with very high puncture protection that exists in 50x406-2.00x20, 55x406-2.2x20 and 62x406-2.5x20 called eContact Plus they are much better than the Super...
Forum: Folding Bikes
04-08-24, 03:04 AM
Replies: 17
Views: 1,355
Posted By Jipe

130mm rear OLD is the race road bike OLD for...

130mm rear OLD is the race road bike OLD for bikes with rim brakes. There is no standardized 130mm OLD for disc brakes.

135mm is the MTB rear OLD standardized both for rim brakes (mainly V-brakes...
Forum: Folding Bikes
04-07-24, 10:06 AM
Replies: 58
Views: 5,539
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: 58
Views: 5,539
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
04-07-24, 01:18 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

No a blueish color of the welding. The...

No a blueish color of the welding.

The problem with a triple chainring+BWR+4 cogs is the low usability consequence of the 3 commands and the slow gear change due to the BWR and poor 4s Brompton...
Forum: Folding Bikes
04-06-24, 10:05 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

The problem with oxygen contaminated titanium...

The problem with oxygen contaminated titanium welding most of the time happen inside the tubes, some oxygen remaining inside the tube while welding.

When this happen, you cannot see anything from...
Forum: Folding Bikes
04-06-24, 09:56 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

I mean no crappy BWR hub too, a real 11s...

I mean no crappy BWR hub too, a real 11s derailleur with a real cassette. And no triple crankset, another remnant of the past same as the 4s cogset and derailleur.

On the Birdy, the only...
Forum: Folding Bikes
04-06-24, 03:48 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

The specific Brompton frame concept with the rear...

The specific Brompton frame concept with the rear wheel folding right under the main frame tube has the drawback that any overall wheel diameter increase also increases the wheelbase, the folded...
Forum: Folding Bikes
04-06-24, 02:15 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

There was a huge evolution in steel alloy while...

There was a huge evolution in steel alloy while nothing happenec for titanium, the alloy used for bike frame is the same as 20 years ago.

Titanium is a great material but welding is a major issue:...
Forum: Folding Bikes
04-05-24, 03:23 PM
Replies: 17
Views: 1,355
Posted By Jipe

Same experience with 9t cog: its to obtain a high...

Same experience with 9t cog: its to obtain a high enough gear inch when riding very fast but its not used often so higher wear and lower efficiency aren't issues.

The solution I use is SRAM XD...
Forum: Folding Bikes
04-05-24, 05:42 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

My experience with Schwalbe tires in ETRTO406...

My experience with Schwalbe tires in ETRTO406 (Marathon, Big Apple, Big Apple Plus, Big Ben Plus, MotoX, Pick-up, Marathon Racer folding, Durano, Durano Plus, Ultremo, Pro-One) is that they all were...
Forum: Folding Bikes
04-05-24, 01:39 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

The choice of ETRTO507 was indeed a marketing...

The choice of ETRTO507 was indeed a marketing choice with the simplistic argument bigger is closer to full size wheels and as such better (they even claimed that its safer).

There is little...
Forum: Folding Bikes
04-03-24, 03:36 PM
Replies: 2,948
Views: 1,033,732
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
04-03-24, 03:54 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

ETRTO507 (there are several other 24" sizes,...

ETRTO507 (there are several other 24" sizes, ETRTO520, ETRTO540) was a BMX wheel size. There are plenty of tires but most of them are wide tires 50mm or wider.

Helix made a wrong decision when...
Forum: Folding Bikes
04-02-24, 03:19 PM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

Front bag: 10kg but its possible to put more. ...

Front bag: 10kg but its possible to put more.

Rear, I don't know, never loaded the rear heavily.
Forum: Folding Bikes
04-02-24, 09:53 AM
Replies: 58
Views: 5,539
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: 58
Views: 5,539
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: 35,888
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
04-02-24, 04:00 AM
Replies: 2,948
Views: 1,033,732
Posted By Jipe

Also wider MTB tires like the Vee Tire Co Crown...

Also wider MTB tires like the Vee Tire Co Crown Gem 57x355.

Several BMX tires in 55x355 (the problem as always with BMX tires is the level of puncture protection).
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