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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 04-14-17, 02:50 PM   #26
kais01
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my 90s T5 with 44/305. It is surprisingly fast when surface is rough, rolling resistance of those Michelins is then comparatively good. A few weeks ago I passed two mamils; when they catched up two red lights later one of them really stared at the bike and asked where the motor is:-)
Have just worn out the rear rim so need to get another. Alu 28-spoke rims are hard to find.
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Old 04-14-17, 02:56 PM   #27
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for winter use mud flap could be even longer..
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Old 04-14-17, 04:03 PM   #28
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took a look at the brommies further up in the thread, both of them are likely to have widened fork and triangle; mine are stock. the 44/305s i use are wide enough to be decent on gravel, they also work fine in snow.

btw, in snow bike geometry reveals itself. slack 'modern mtb' geometry and too much trail creates self-steering, and such a bike may hopelessly steer and skid back and forth, as the rider tries to keep the bike on a narrow track/ridge of packed snow for example after a car or people walking. its not uncommon that such a bike just comes to a stop.

the brompton is here pretty good, and even better with the smaller 305 wheels having shorter trail. it runs best if the handlebars are tilted somewhat forward, as to have the effect of a stem. this goes with the 349s as well.

have to say, one of the greater assets of the brompton in my view are the standard tires. they have decent puncture protection, and roll unreasonably well on tarmac. have used my other brommies together with friends with serious racers in 20+ mph peleton club rides, and the difference in rolling is small, not to say minimal. they go best just under 4 bar.

so i would not convert my only brommie to 305s, but having one extra for hikes in terrain or snow is perfect. an extra bike is also handy to have as a backup, or for loan to friends and family
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Old 04-15-17, 02:28 AM   #29
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Woow!!
305 ultrawide tires on brompton?
Very nice idea!
How does it rides? Is is Stabble?

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Originally Posted by kais01 View Post
my 90s T5 with 44/305. It is surprisingly fast when surface is rough, rolling resistance of those Michelins is then comparatively good. A few weeks ago I passed two mamils; when they catched up two red lights later one of them really stared at the bike and asked where the motor is:-)
Have just worn out the rear rim so need to get another. Alu 28-spoke rims are hard to find.
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Old 04-15-17, 04:18 AM   #30
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well they are not ultra wide, they are 44, though i think on the fat side for a 44. in this size all kinds of sluggish children bike tyres are abundant; but can really recommend the michelins. they roll fast, and the rubber compound is adhesive to snow and ice, not stiff and slippery.

the ride is very good i think. it is at least fast enough to keep up with or pass any number of mamils on mtbs and racers. i am pushing 60 myself btw, so i am older than most mamils. but i dont wear lycra when commuting

on the brompton as with any small wheel bike its beneficial to position the handlebars forward a bit, this adds stabilty and compensates for the lack of gyroscopic force in the wheels. i like to have them just a bit more forward than when i took the photo. on my summer bromptons i have lower bars angled forward about 45 degrees.

it is then stable also at speed, but as with any brompton with the added benefit of really quick steering response.
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Old 04-25-17, 07:43 AM   #31
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Neatly done, I didn't know there were cross tyres that fit on a 305 without modifying the frame elements.
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Old 04-25-17, 04:12 PM   #32
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It's an ERTO 349 wheel. I think the widest tire in that size -- Greenspeed scorcher -- is 40 mm.
The bead seat radius of the so called 18" size tire (ISO355mm) is just 3mm - 3mm! - greater than the so called 16" size tire (ISO349mm). It would be straightforward to convert a 349mm wheel bike to 355mm wheels and run the 50mm wide Schwalbe Big Apples available in that size IF the bike's frame/fork/brakes had the clearance.

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Old 04-26-17, 07:34 AM   #33
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So what is the widest tire that 20" wheeled dahon bikes can accept?
There are plenty of pictures on the 'net of V-brake Mus (Mues?) fitted with Big Apples.
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Old 04-27-17, 08:01 PM   #34
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The bead seat radius of the so called 18" size tire (ISO355mm) is just 3mm - 3mm! - greater than the so called 16" size tire (ISO349mm). It would be straightforward to convert a 349mm wheel bike to 355mm wheels and run the 50mm wide Schwalbe Big Apples available in that size IF the bike's frame/fork/brakes had the clearance.
305 Big Apples more or less match standard 349 tires in outer radius, but there is no way they would have the clearance on 355.

That said, I think people put slicks on 355s on Bromptons, I recall seeing one here.
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Old 04-28-17, 01:26 AM   #35
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Originally Posted by kais01 View Post
my 90s T5 with 44/305. It is surprisingly fast when surface is rough, rolling resistance of those Michelins is then comparatively good. A few weeks ago I passed two mamils; when they catched up two red lights later one of them really stared at the bike and asked where the motor is:-)
Have just worn out the rear rim so need to get another. Alu 28-spoke rims are hard to find.
What breaks are you using? I had assumed that the factory break arms would have a too short for 305 rims on the Brompton frame and at the same time the factory breaks not only have a reverse setup for fitting the cable to the break but also already far longer arms (more reach) than usual, so finding a 3rd party replacement with even more reach is not easy. It looks like dual pivot breaks which were not standard if your bike is from the 90s.
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Old 04-28-17, 01:52 AM   #36
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i bought a pair of front saccon brakes from friendly guy werner at funbikeshop in germany. their reach is up to 91 mm.

see i bought two front brakes, dont remember exactly why, but i think it matched better the brompton hardware on the rear. mounting was reibungslos.

saccon brakes are from an italian company, you may find them at ebay.it, but also ebay.de. their stopping power is ok, not more. but definitely better than pre99 brompton brakes.
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Old 04-29-17, 12:31 AM   #37
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here i found a good offer on the same brake, good thing they sell front brakes only.

FELGENBREMSE / SEITENZUGBREMSE / HANDBREMSE Synchron von SACCON 28x1.75 | eBay
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Old 04-29-17, 01:53 AM   #38
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I was look for this threat and finally got it. Great advice you all have share now I can surely do changes to my bike.
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Old 05-02-17, 11:29 AM   #39
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From my research, TEKTRO 900A slr and ALHONGA HJ-890A brakes should fit as well, but I haven't checked them out myself yet.

Also, SACCON SENCRO III 21/73 72/92 (they might be the same as kais01 used, model name is similar)

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Old 05-02-17, 11:37 AM   #40
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see i bought two front brakes, dont remember exactly why, but i think it matched better the brompton hardware on the rear. mounting was reibungslos.
It's worth noting, the brakes need to have their cables routed upside down because of how the bike folds.
Not every brake allows for this cable direction swap.
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Old 05-02-17, 01:50 PM   #41
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well raftr, as is obvious from the photos above there was no problem reversing the pull of the saccon brakes.

i dont remember in detail why i opted to buy two front brakes, it is likely that its bolt length was better for mounting on the rear of the brommie. there might have been some minor tweaking necessary.

but nothing that kept me awake at night. as i said it was in all a smooth experience.
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Old 05-02-17, 03:40 PM   #42
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The rear brake bolt is indeed very long. It also houses the seatpost stop.
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Old 05-04-17, 03:22 PM   #43
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well raftr, as is obvious from the photos above there was no problem reversing the pull of the saccon brakes.
Of course, I was just pointing out not all brakes had that option, if someone were to use a different brake model than Saccon for the conversion.
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Old 05-04-17, 06:49 PM   #44
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Two more examples of wider tires on 305s:




^ From Big Apple Rohloff Brompton - Kinetics (more photos)





^ From https://www.instagram.com/bike_vogue (many more photos of that one)
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Old 05-12-17, 05:22 PM   #45
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Both bikes above, I presume, have modified forks and rear triangles.

I found an older article about converting a Brompton to thicker tyres on 305 rims:

Off-road Brompton
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