Battery Powered Taillights
Rack Mounted Taillights
The rack mount taillights all mount to a horizontal bracket with two holes either 50mm or 80mm apart. I sell some brackets to allow mounting taillights onto racks without suitable mounts. Scroll down this page towards the bottom to see these adapters. The Tubus Cargo and Logo racks incorporate the proper mount for these lights.
Busch & Müller's published run times for taillights tell you how long you should expect the taillight to be at full brightness. The light will stay lit longer than their published specification, but will gradually become dimmer. Some other manufacturers base their run time ratings on the total time, even counting when the LED is barely lit.
Busch & Müller Toplight Line Permanent & Senso
Busch & Müller's newest (2011) battery taillights use the same "Line-Tech" fresnel to spread the light from two bright LEDs across the entire width of the taillight. 38 hour run time on a single AA battery.
"Permanent" version has a 2 position On/Off switch. "Senso" version has a 3 position switch, On/Off/Senso. When you switch it to Senso mode, the light switches on for about 4 minutes, and then, if it's dark and if the light senses movement, the light will stay on. When your bike stops moving, the light will remain on for about 4 minutes and then automatically switch off. This gives you light while stopped at an intersection. As you ride in daylight, the light will switch off, and only come on at twilight and only if the bike is moving.
Included is a special screw and wrench which can be used to secure the battery from theft.
Toplight Line Permanent (On/Off), 38 hour run time, Part Number B&M3235BL00: $ 37.50 In Stock
Toplight Line Senso (On/Off/Senso), 38 hour run time, Part Number B&M3235BLHR00: $ 44.50 In Stock
Busch & Müller DToplight XS Permanent & Senso
The new Busch&Müller DToplight XS Permanent mounts on a rack with either 50mm wide studs or 80mm wide studs. You install the bolts in the position your rack requires. There is a two position on / off switch on the bottom. It is powered by 2 AA batteries. 50 hour run time. Part Number B&M325BL: $ 26.50
The DToplight XS Senso adds a third switch position. A light sensor and a motion sensor combine to turn the light on and off automatically. As long as the bike is moving, the light switches on in the dark, and off in daylight. The Senso version is otherwise identical to the Permanent version. It is powered by 2 AA batteries. 50 hour run time. Part Number B&M325BLHR: $ 34.00
Busch & Müller Toplight Flat S
The Toplight Flat S uses Busch & Müller's "Line Tec", a series of reflectors that spreads the light from the central LED across the width of the taillight. And don't worry, the vertical bars glow red. They're just overexposed in this photo.
Toplight Flat S Permanent (On/Off), 50 hour run time, Part Number B&M329BS-02: $ 26.50
Toplight Flat S Senso (On/Off/Senso), 50 hour run time, Part Number B&M329BSHR-02: $ 34.00
Fender Mounted Taillights
Fender mount taillights require two holes drilled in the rear fender. The holes should be 5mm in diameter, one above the other, 20mm apart. Care should be taken to mount the light so that the brightest part of the beam is at driver's eye level. Where you mount the light along the curve of the fender determines where the beam is aimed.
I only recommend mounting my fender-mount taillights on high quality fenders such as Gilles Berthoud, or Esge/SKS. Many other fenders are made only of plastic and are too light so they can easily break when you mount a light on them.
People have asked me if the Cross Bracket is strong enough to hold our battery powered Spanninga taillight that you can see below. I don't know if it's strong enough or not. Try it at your own risk.
Spanninga Pixeo Xb & Pixeo Xba
The Pixeo Xb and Xba from Spanninga are battery powered taillights designed for mounting on a fender. If you already have a dynamo powered taillight on a rear rack, put your fender to work carrying another light. ThePixeos are ideal. They're very compact (55mm tall) and weigh just a hair more than nothing. The LED is on top and below is a reflector. The Pixeo uses 2 AAA batteries, included.
Available in two battery powered versions. The Pixeo Xb (pictured above on the right) has a simple On/Off button. Push it once, and the light comes on. Push again, it goes off. The Pixeo Xba (pictured above in the middle) looks the same, but adds an automatic mode. When in Auto, the light will switch on by itself, but only when it's dark, and only when the bike is moving. It has both a light and a motion sensor. In the photo above, I also show the 6 volt dynamo version, the Pixeo Xs. It's on the left and of course, it has no switch, as it's controlled either by the tire driven dynamo, or the hub dynamo headlight's switch.
Pixeo Xb, two position button type switch; On/Off, Part Number SPA135518: $ 12.50
Pixeo Xba, three position button type switch; On/Off/Auto, Part Number SPA135618: $ 16.00
Pixeo Xs, for 6 volt dynamo systems only, Part Number SPA135118: $ 16.50
We also have a pair of mounts for any of the Pixeo models. The Pixeo is intended for fender mounting. But Spanninga makes two small stainless steel mounts; one to attach the taillight to a rear cantilever brake stud, and the other to attach at a seatpost binder bolt.
Set of 2 mounts for Pixeo, Part Number SPA811450-55: $ 4.50
Hella RL 1500
This little taillight has threee LEDs and easily attaches to the seat post without tools. Use it in steady or flashing mode. The typical run times are 50 hours steady and 180 hours flashing. A simple and reliable switch is on top.
Hella RL ONE: $ 15.00
Spanninga DX 25
This small taillight attaches to the seat post or seat stay without tools, and just a coin is needed to change the two AAA batteries. The light pivots vertically on its mount, so adjusting the aiming of the light is easy, whether it's on the seat post or a seat stay.
Spanninga DX 25: $ 17.50
All taillights are LED types. They do not have bulbs to wear out. Since taillights do not need a tightly focused beam, LEDs work better than bulbs, since they are brighter than bulbs of comparable wattage. I do not sell taillights that use bulbs, and I do not sell replacement bulbs for taillights. If you have a taillight that uses a bulb and you need a replacement, I highly recommend replacing that taillight with an LED type. Unlike headlights, where there are pros and cons to both halogen bulbs and LEDs, for taillights there's no advantage to a bulb.
This is a rear view (actually this faces front) of a rack mount taillight. You see here two bolts coming out of the housing. Some taillights ship without the bolts installed. Some, like this B&M design have four positions where you can push out the plastic and place the bolts from the inside. You can choose either 80mm spacing or 50mm spacing for the bolts. Here the spacing is 80mm.
Some other taillights such as the Eclipse have the bolts already mounted in the 50mm position. I know of racks with both 80mm and 50mm spaced mounts, and I know of racks with only 50mm spaced mounts, but I don't know of any racks with only 80mm mounts. So many of the taillights I stock only have the 50mm mount option.
Some racks like most Tubus models have a bracket on the rear to mount these lights. But some don't. So we have adapters.
If your rear rack has a single hole in the rear that will take a bolt which faces in the direction of travel, you can mount this bracket into that hole and then you'll have the 50mm and 80mm mounting points for any of the Busch & Müller rack mount taillights such as the DToplight XS Plus above. Single Hole Bracket: $ 6.75
If your rack has no hole in the rear but does have either a top plate or some cross braces, this T bracket can be clamped to the top of your rack and then the taillight can be bolted to it.
Here's a DToplight XS Plus mounted on a T bracket using the 80mm bolt positions. T bracket: $ 5.00
If your bike has a seat post binder bolt that's big and not recessed into the seat cluster, you can probably use this bracket to mount a taillight on the seat post binder bolt. The hole on the left would be at the seat post binder. The hole is about 8.5mm in diameter. Seat Post Binder Bracket: $ 3.50
I sell several Tubus racks which incorporate a mounting bracket which will fit many types of Busch & Müller tail lights including the DToplight Permanent and Eclipse Xb. The Tubus Cargo is a heavy duty tubular cromoly steel rack for extended touring and heavy loads.
Where to Buy?
See this page for a list of bicycle shops that generally stock Busch & Müller, Schmidt, Pitlock, Supernova and Spanninga, or can order them for you. If there's no shop in your area, you can of course order directly from us.
Ordering from us.
Almost everything you need to know about pricing and ordering a lighting system can be found here.
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This page updated: Thursday, September 10, 2015
Peter White Cycles