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 recommend purchasing the larger tubes for those tires.

Solutions

Please see the tire information table 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    
rimTIRE NAMEnoteswidthPSIpricewt (g)S/V tubeP/V tubeWeb Part
451IRC Roadlite 1-1/8″100$ 15.00 21020 x 1-1/820 x 1-1/81001
451Odyssey Red Racer 1-1/8″90$ 15.00 24520 x 1-1/820 x 1-1/81601
451Primo Comet 451discontinued1-1/8″11024520 x 1-1/820 x 1-1/8
451Primo V-Trak 1-1/8″85$ 16.00 21820 x 1-1/820 x 1-1/81004
451Bike Friday Sportdiscontinued1-1/8″11023520 x 1-1/820 x 1-1/8
451Primo Comet 451 1-3/8″85$ 18.00 25020 x 1-1/820 x 1-1/81002
451Primo Comet Kevlar 1-3/8″85$ 25.00 28520 x 1-1/820 x 1-1/81605
451Ritchey Speedmax hybrid 1-3/8″65$ 16.00 29020 x 1-1/820 x 1-1/81607
406Continental Grand Prix 1.125″120$ 35.00 19818 x 1-3/818 x 1-3/81005
406IRC Metro 1.25″100$ 17.00 27018 x 1-3/818 x 1-3/81609
406Schwalbe City Marathon 1.25″115$ 15.00 31018 x 1-3/818 x 1-3/85045
406Schwalbe City Marathon Kevlar 1.25″115$ 23.00 34018 x 1-3/818 x 1-3/89026
406Ritchey Speedmax Rov’r 1.3″100$ 20.00 26818 x 1-3/818 x 1-3/81612
406Primo Comet 1.35 1.35″100$ 18.00 25518 x 1-3/818 x 1-3/81006
406Primo Comet 1.35 Kevlar 1.35″100$ 25.00 28318 x 1-3/818 x 1-3/89033
406Continental Top Touringdiscontinued1.375″7040518 x 1-3/818 x 1-3/8
406Haro Ninjadiscontinued1.5″6536018 x 1-3/818 x 1-3/8
406Shwalbe Marathon Kevlar 1.5″100$ 26.00 41518 x 1-3/818 x 1-3/81614
406Avocet Freestyle 1.75″85$ 36.00 36320 x 1.5/1.920 x 1.751616
406Maxxis Lug 1.75discontinued1.75″6041520 x 1.5/1.920 x 1.75
406Primo Comet 1.75 1.75″100$ 18.00 33520 x 1.5/1.920 x 1.751618
406Primo Comet 1.75 Kevlar 1.75″100$ 25.00 37020 x 1.5/1.920 x 1.751620
406Primo V-Monster 1.75″40-65$ 16.00 42020 x 1.5/1.920 x 1.751009
406Primo V-trak 1.75″40$ 16.00 40020 x 1.5/1.920 x 1.751622
406Ritchey Megabite 1.75discontinued1.75″??20 x 1.5/1.920 x 1.75
406Ritchey Speedmax 1.75 Omega 1.75″35$ 13.95 42020 x 1.5/1.920 x 1.751624
406Maxxis Lug 2.0discontinued2.0″??20 x 1.5/1.920 x 1.75
406Ritchey Megabite 2.0discontinued2.0″4046520 x 1.5/1.920 x 1.75
406Ritchry Speedmax 2.0 Omegabackordered2.0″?$ 15.00 44520 x 1.5/1.920 x 1.751626
406IRC MinuteMan 2.10 2.1″40-65$ 18.00 48520 x 1.5/1.920 x 1.751628
406Primo V-track II 2.1″40$ 16.50 52020 x 1.5/1.920 x 1.751630
406Ritchey Speedmax 2.1 Alpha 2.1″40$ 16.00 47020 x 1.5/1.920 x 1.751632
349Primo Comet 349 1-3/8″85$ 18.00 21016 x 1-3/816 x 1-3/85051
349Primo Comet 349 Kevlar 1-3/8″85$ 25.00 21516 x 1-3/816 x 1-3/89035
349Schwalbe City Marathon Kevlarbackordered1-3/8″100$ 24.00 29016 x 1-3/816 x 1-3/89024
203Trailer Tire 1.75″35$ 9.50 23512.5 x 1.7512.5 x 2-1/41011
 (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.