Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-20-12, 07:58 AM   #1
proteam111
Newbie
Thread Starter
 
Join Date: Feb 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Proteam folding bike and tyre punctures

Hello Im new to this forum. I bought a Proteam folding bike 6 Months ago and apart from punctures the bike is good. I have at about 12 punctures, all rear end. the bike is nearly off the road mostly.

The back tyre has been changed twice, four new inner tubes and numerous tyre repairs. When I bought the bike, I recall seeing max weight on tyre to be 65kilo. Im 78 kilo which is about average for a man. This bike is sold for commuters which are adults. I have double checked the wheel frame which is smooth.

Anyone else expereince this because I never had this problem with a larger wheel / bike. Im thinking about getting a solid tyre.

many thanks

tony in Hampshire
proteam111 is offline   Reply With Quote
Old 02-20-12, 09:38 AM   #2
rex615
canis lupus familiaris
 
rex615's Avatar
 
Join Date: Dec 2011
Location: North Carolina
Bikes: En plus one
Posts: 2,255
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
What kind of rear tire are you using.?

You say the rear tire has been changed twice, do that mean you are on your third new tire?

How much air pressure are you using in the back tire?

Can you determine what is causing the punctures? ie, glass, nails, thorns, pinch flats?

You can generally double the tire weight capacity since it is shared by the two tires (give or take for weight distribution). So your weight ishould not be an issue.
rex615 is offline   Reply With Quote
Old 02-20-12, 11:00 AM   #3
proteam111
Newbie
Thread Starter
 
Join Date: Feb 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rex615 View Post
What kind of rear tire are you using.?

You say the rear tire has been changed twice, do that mean you are on your third new tire?

How much air pressure are you using in the back tire?

Can you determine what is causing the punctures? ie, glass, nails, thorns, pinch flats?

You can generally double the tire weight capacity since it is shared by the two tires (give or take for weight distribution). So your weight ishould not be an issue.
Hi Rex. thanks for your reply. Yes Im on third tyre now and forth inner tube. The first inner tube exploded like a bomb. The other punctures seem to be glass but im not sure unless it was sharp stones. One inner tube had a 6mm tear in it. I am riding the same route to work as previous bike so I presume that glass is not greater than before. I cannot see glass on the road.
The front tyre is the original - Rotation Nylon , 16x1.75 max psi = 43.5
The rear now changed to Cheng shen Nylon. 16x1.75 max psi = 35.0
I have kept the tyre inflation to about 30 psi in each tyre incase it explodes
thanks again
tony
proteam111 is offline   Reply With Quote
Old 02-20-12, 01:58 PM   #4
badmother
Senior Member
 
badmother's Avatar
 
Join Date: Nov 2007
Bikes:
Posts: 3,255
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
I would look closely on your rim and spoke ends if the problem could be here. I would remowe the rimtape and closely inspect the rim with my fingers. I would put new high quality rimtape on and try again. Unless you are riding trough areas with plenty broken glass or similar.
badmother is offline   Reply With Quote
Old 02-20-12, 02:20 PM   #5
proteam111
Newbie
Thread Starter
 
Join Date: Feb 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks badmother. i never thought about rim tape, i will take a closer look. Do you think the tyres are designed to carry average weight. The wheels are small and surely the pressure must be greater than say a 26 wheel. Im wondering if they were designed for children. Then again i saw a large person the other day whilst in my car. I almost stopped to ask her but it was a busy road

thanks

tony
proteam111 is offline   Reply With Quote
Old 02-20-12, 02:44 PM   #6
snafu21
Senior Member
 
snafu21's Avatar
 
Join Date: May 2008
Location: The Mangroves, UK
Bikes: None.
Posts: 1,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
16" wheels are fine, but fall into larger potholes instead of rolling over them. Generally it's better to keep tyre pressures at the max indicated on the sidewall for the most puncture resistance. Cheaper bikes can come with cheaper inner tubes and tyres, but it's hard to generalise.

Eventually many folder-drivers fit something like Schwalbe Marathons, Schwalbe Kojaks or Brompton tyres,all of which are cheaper on Ebay. These have various 'puncture-proof' features like Kevlar layers.

Glass can work its way into a tyre and be invisible - you fix the flat and get one in the same place a week later. Cotton wool run around the inside can find it by snagging.

Other remedies include 'Slime' a green goo you put in the tube, and checking that the rim tape is laid centrally.

Finally, pressure is pressure, and constant in a sealed vessel at a given temperature and volume - 30psi is the same in a 16" tyre as 30 psi in a 26" although sidewall height is much lower. So a pothole will bottom the 16" rim much earlier - another reason for keeping pressures up to max.

35 psi on the new rear seems low, sure it's not 3.5 bar?
snafu21 is offline   Reply With Quote
Old 02-20-12, 02:49 PM   #7
prathmann
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Bikes:
Posts: 6,142
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 110 Post(s)
I agree that those max. pressure numbers look pretty low for that width tire. I'd want to inflate to at least 45 psi on a 16x1.75" tire (esp. in the back).
prathmann is offline   Reply With Quote
Old 02-20-12, 03:10 PM   #8
proteam111
Newbie
Thread Starter
 
Join Date: Feb 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for more information. looks like some detective work is required in my case. Im going to take the wheel off again and check everything. Does slime really live up to the headlines. I considered solid tyres but the ride is hard, as you would expect. I will look at other resistant type tyres too.

tony
proteam111 is offline   Reply With Quote
Old 02-21-12, 01:38 AM   #9
snafu21
Senior Member
 
snafu21's Avatar
 
Join Date: May 2008
Location: The Mangroves, UK
Bikes: None.
Posts: 1,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
People disagree about Slime. I use it on my Mountain bike, and never get punctures, others say it just clogs the valves up. It adds weight, but not much. A 16" wheel won't take a lot - do leave room for the air.

16" wheels are fitted to Bromptons and other bikes, and punctures are less frequent than we might think. They're a nuisance when they do happen though. Max pressures are your friend, in my pneumatic opinion.
snafu21 is offline   Reply With Quote
Old 02-21-12, 02:51 AM   #10
badmother
Senior Member
 
badmother's Avatar
 
Join Date: Nov 2007
Bikes:
Posts: 3,255
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Quote:
Originally Posted by proteam111 View Post
The front tyre is the original - Rotation Nylon , 16x1.75 max psi = 43.5
The rear now changed to Cheng shen Nylon. 16x1.75 max psi = 35.0
I have kept the tyre inflation to about 30 psi in each tyre incase it explodes
thanks again
tony
Sounds real low if this is the right numberst. Some small tyres are for childrens bikes, some are high quality for folders. I can not buy the high quality ones locally, I have to buy them online. Unless you have a bikeshop nearby that deal with foldingbikes maybe you should just buy some online. Search for older threads about tyres and read, there are as many opinions as there are posters .

http://www.sjscycles.co.uk/tyres-16-(305)-dept339_pg1/
badmother is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 04:04 PM.