These fit handlebars to one inch and fits the round mounting attachment on the back of your GPS. These include a rubber strip for smaller handlebars too.
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Buy Motorcycle / Bike Handlebar Mount for TomTom One 125 130 130S 140 140S Ease XL 325S 325SE 330 330S 335S 340 340S [...]

Compatible WithTomtom GO 510Tomtom GO 520Tomtom GO 530Tomtom GO 630Tomtom GO 710Tomtom GO 720Tomtom GO 730Tomtom GO 910Tomtom GO 920Tomtom GO 920 TrafficTomtom GO 930Tomtom ONE XLTomtom ONETomtom ONE XL*S
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Buy 30dB Powerful Amplified External GPS Antenna Receiver for Tomtom ONE, ONE XL, GO 510, 520, 530, 630, 710, 720, [...]

Arkon’s TTGO123 coveniently fits into most standard cup holder openings from 2.5″ to 3.25″. The adjustable flywheel base allows the user to find the perfect fit to the cup holder in the vehicle. Compatible with TomTom GO 520, 530, 720, 730, 920, 930. NOT Compatible with TomTom GO 740 or other [...]

This new swivel vent mount works in all vehicles, using horizontal vent louvers. This mount utilizes a ball joint which allows movement in any direction.
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Buy IG-A03+MC200: Vent Mount with Cradle for Magellan RoadMate: 1200 1212 1230 1400 1412 1430; Maestro: 3200 3210 3220 3225 3250 4200 4210 4220 4250 [...]

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Buy TTEP-SPH-GAFM: Mini Friction Mount for TomTom 125, 130, 130*S, 330, 330*S at Amazon

Securely Hold Your GPS Unit On Your Dash!The Auto Dash Mount from Accessory Power is your simple and effective solution for portable on-dash GPS display. Beginning with a solid weighted dashboard grip design, the Auto Dash Mount stays securely in place on your dash. The 360-degree rotating head allows you to choose from [...]

Arkon’s TTGO115 is an ideal mounting solution for TomTom GO 520, 530, 720, 730, 920, 930. The bundle includes the Travelmount mini windshield suction pedestal , the Dual T to TomTom GO slide in pattern adapter plate and the 70mm circular adhesive console or dashboard disc.
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Buy ARKON TTGO115 TomTom [...]

Secure your Garmin StreetPilot c-series GPS navigator to your vehicle’s dash with this distinctive and sleek dashboard mount. Compatible with the StreetPilot c320, c330, and c340 models, the easy-to-install mount keeps your GPS firmly in place, so you don’t need to worry about bad viewing angles or unfortunate tumbles. It also positions your [...]

# Ideal for use with portable GPS / PND devices
# 80mm suction disc acts as the base for your windshield suction pedestal
# Easily transferred from one vehicle to another
# Includes CM012 Dash Mount, CM014-2 Travelmount mini windshield suction pedestal, and APTTOGO adapter plate for TomTom GO devices (520 530 720 730 920 930 [...]

Here is a great mount for your GPS. We have grouped a custom cradle with a handlebar mount that fits bars up to 1 inch diameter. We even include strips so that this mount can be used for much smaller handlebars.
The holder is a real work of art. It permits full access to [...]