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Inner tube and tire size compatability

Symptoms

I will be buying a pair of the Prima V Monsters 20 x 1.75 to replace my 20 x 1.35 tires. Do I need to buy the 1.75 tubes or can I use the existing tubes with the new tires?

Causes

Inner tubes should be only slightly smaller than the tires. Using too small tubes causes the tube to stretch and thus become thin and prone to flats. In your case, I would recomend purchasing the larger tubes for those tires.

Solutions

Please see the tire information table (click on the 'related document' link below) for more information about the various tires we carry and the inner tubes they deserve.

Additional Info
  BIKE FRIDAY TIRE INFORMATION TABLE       6-Aug-01        
rim TIRE NAME notes width PSI price wt (g) S/V tube P/V tube Web Part
451 IRC Roadlite   1-1/8" 100 $ 15.00 210 20 x 1-1/8 20 x 1-1/8 1001
451 Odyssey Red Racer   1-1/8" 90 $ 15.00 245 20 x 1-1/8 20 x 1-1/8 1601
451 Primo Comet 451 discontinued 1-1/8" 110 - 245 20 x 1-1/8 20 x 1-1/8 -
451 Primo V-Trak   1-1/8" 85 $ 16.00 218 20 x 1-1/8 20 x 1-1/8 1004
451 Bike Friday Sport discontinued 1-1/8" 110 - 235 20 x 1-1/8 20 x 1-1/8 -
451 Primo Comet 451   1-3/8" 85 $ 18.00 250 20 x 1-1/8 20 x 1-1/8 1002
451 Primo Comet Kevlar   1-3/8" 85 $ 25.00 285 20 x 1-1/8 20 x 1-1/8 1605
451 Ritchey Speedmax hybrid   1-3/8" 65 $ 16.00 290 20 x 1-1/8 20 x 1-1/8 1607
406 Continental Grand Prix   1.125" 120 $ 35.00 198 18 x 1-3/8 18 x 1-3/8 1005
406 IRC Metro   1.25" 100 $ 17.00 270 18 x 1-3/8 18 x 1-3/8 1609
406 Schwalbe City Marathon   1.25" 115 $ 15.00 310 18 x 1-3/8 18 x 1-3/8 5045
406 Schwalbe City Marathon Kevlar   1.25" 115 $ 23.00 340 18 x 1-3/8 18 x 1-3/8 9026
406 Ritchey Speedmax Rov'r   1.3" 100 $ 20.00 268 18 x 1-3/8 18 x 1-3/8 1612
406 Primo Comet 1.35   1.35" 100 $ 18.00 255 18 x 1-3/8 18 x 1-3/8 1006
406 Primo Comet 1.35 Kevlar   1.35" 100 $ 25.00 283 18 x 1-3/8 18 x 1-3/8 9033
406 Continental Top Touring discontinued 1.375" 70 - 405 18 x 1-3/8 18 x 1-3/8 -
406 Haro Ninja discontinued 1.5" 65 - 360 18 x 1-3/8 18 x 1-3/8 -
406 Shwalbe Marathon Kevlar   1.5" 100 $ 26.00 415 18 x 1-3/8 18 x 1-3/8 1614
406 Avocet Freestyle   1.75" 85 $ 36.00 363 20 x 1.5/1.9 20 x 1.75 1616
406 Maxxis Lug 1.75 discontinued 1.75" 60 - 415 20 x 1.5/1.9 20 x 1.75 -
406 Primo Comet 1.75   1.75" 100 $ 18.00 335 20 x 1.5/1.9 20 x 1.75 1618
406 Primo Comet 1.75 Kevlar   1.75" 100 $ 25.00 370 20 x 1.5/1.9 20 x 1.75 1620
406 Primo V-Monster   1.75" 40-65 $ 16.00 420 20 x 1.5/1.9 20 x 1.75 1009
406 Primo V-trak   1.75" 40 $ 16.00 400 20 x 1.5/1.9 20 x 1.75 1622
406 Ritchey Megabite 1.75 discontinued 1.75" ? - ? 20 x 1.5/1.9 20 x 1.75 -
406 Ritchey Speedmax 1.75 Omega   1.75" 35 $ 13.95 420 20 x 1.5/1.9 20 x 1.75 1624
406 Maxxis Lug 2.0 discontinued 2.0" ? - ? 20 x 1.5/1.9 20 x 1.75 -
406 Ritchey Megabite 2.0 discontinued 2.0" 40 - 465 20 x 1.5/1.9 20 x 1.75 -
406 Ritchry Speedmax 2.0 Omega backordered 2.0" ? $ 15.00 445 20 x 1.5/1.9 20 x 1.75 1626
406 IRC MinuteMan 2.10   2.1" 40-65 $ 18.00 485 20 x 1.5/1.9 20 x 1.75 1628
406 Primo V-track II   2.1" 40 $ 16.50 520 20 x 1.5/1.9 20 x 1.75 1630
406 Ritchey Speedmax 2.1 Alpha   2.1" 40 $ 16.00 470 20 x 1.5/1.9 20 x 1.75 1632
349 Primo Comet 349   1-3/8" 85 $ 18.00 210 16 x 1-3/8 16 x 1-3/8 5051
349 Primo Comet 349 Kevlar   1-3/8" 85 $ 25.00 215 16 x 1-3/8 16 x 1-3/8 9035
349 Schwalbe City Marathon Kevlar backordered 1-3/8" 100 $ 24.00 290 16 x 1-3/8 16 x 1-3/8 9024
203 Trailer Tire   1.75" 35 $ 9.50 235 12.5 x 1.75 12.5 x 2-1/4 1011
  (C) 2001 Bike Friday; for informational purposes only, no warranty of accuracy implied; subject to change at any time. For more information see www.bikefriday.com or call (800) 777-0258.  

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