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

Go Back   > >

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

User Tag List

Thread Tools Search this Thread
Old 09-22-07, 07:55 PM   #1
Thread Starter
solveg's Avatar
Join Date: Jun 2007
Location: Winfield, KS
Bikes: 07 Rivendell Atlantis, 83 Schwinn Peloton, 94 Scott Cheyenne, 81 SR Touring Bike, 80's CCM,
Posts: 4,928
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sorry, dumb question here....

I've read Sheldon's site, I've done multiple searches here. I'm just confused.

If I want to put wider tires on my 27" wheels for gravel roads, I can put 700c wheels on if my brakes have enough room to drop down.

BUT! I ride frames that have a tight standover because I have a long torso. As far as I can figure out, putting wider tires on a smaller 700C wheel will result in up to 2" of additional height?

Can someone just tell me exactly what to buy which will give me the most float over gravel but the least impact on standover? I'm touching the top bar as it is.... (luckily, I'm female).
solveg is offline   Reply With Quote
Old 09-22-07, 07:59 PM   #2
well biked 
biked well
well biked's Avatar
Join Date: Jul 2005
Posts: 7,177
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 52 Post(s)
The bead seat diameter of a 27" rim is 630mm, the BSD of a 700c rim is 622mm. That means a difference in radius of 4mm, which is the pertinent number regarding brake reach and standover height difference. So, assuming an equal sidewall height between tires, a 700c wheel will lower the standover height by 4mm (which is very little, of course), compared to a 27" wheel. Hope this info helps-
well biked is offline   Reply With Quote
Old 09-22-07, 08:36 PM   #3
Senior Member
Join Date: Jun 2006
Posts: 1,404
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You will gain 4mm standover with a 700c wheel.

If you put a wide tire on a narrow 700c rim, you will lose some of that gain, but probably not all of it and certainly not 2 inches.

If you put a wide tire on a wider 700c rim you can have your cake and eat it too. You won't lose any of the gain and the combo will be a better, safer fit.
McDave is offline   Reply With Quote

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 02:05 AM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.