Category Archives: My Brompton

2017 Best wishes

The very best of wishes for the New Year to you from the Aussie household. We’ve had a very interesting 2016 year & I’m sure that regular readers of the blog have observed the many outings & happenings of the Brompton family.

The introduction of Ralph-e reminds me that Brompton are also crafting an e-bike so maybe a good time to offer my experience & recommendations?

Accordingly, “a Plea to Mr Brompton…”

I’d like a lightweight mid-drive Pedelec Brompton with torque-sensing BB & on-bike battery storage, easily removable (aircraft-legal, 100Wh module units), but not impinging on luggage capability. I’m also happy to use my local hills for testing of various gearing options, & undertake frequent travel to review in-field scenarios not available to UK residents. (e.g. why wait to get your hot weather testing done?)

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2016 Seasons greetings

Seasons greetings to all from the Aussie household – & the Brompton family…

What did the year bring? Between Mrs Aussie & I, we did the London BWC & Sydney BUC & got another Pennants badge. Pretty good BBB year I’d say? (i.e. Brompting, Blogging & Bowling)

Ralph-e extras

Tools –

Along with my Brompton toolkit (stored on-board), here’s Ralph-e’s luggage bag set of tools.
There’s a few new items that most Brompton owners wouldn’t include but you’ll probably pick them from the descriptions below.

  • Brompton toolkit
  • 17mm front wheel nut ring spanner
  • Spoke tool
  • Allen keys
  • Pocket knife/scissors for heat-shrink removal
  • Electrical & duct tapes for cable repairs
  • CO2 inflator
  • CO2 cartridge
  • Tyre levers
  • Puncture repair kit
  • Tyre pump – Topeak MiniDualG
  • SV4 tube (in addition to one in the mainframe)

Tweaks –

Knowing Ralph-e was going to become considerably heavier after the electric conversion, & probably needing good stability when folded & rolling, in preparation I moved/robbed Robinson’s rear rack (after all, the rack weight was unlikely to be noticed on Ralph-e & Robinson’s role as “spare” would just as easily be accomplished as an M6L?). This turned out to be a very worthwhile operation. However, what I hadn’t anticipated was the borderline stability when Ralph-e was folded (especially with the luggage bag fitted). With the front wheel motor & battery weight concentrated outside the center-line of a folded Brompton, great care was needed to avoid toppling when transporting, etc. Seeing a BikeFun Eazy wheel extender on a Brompton at the Urban Challenge, what I may have considered as “functional bling” now leapt into mind as “essential function”? Sure enough, BikeFun’s brilliant gadget was right at home on Ralph-e & has quickly been integrated into the Brompton fold sequence (i.e. “Left pedal down, right wheel out, park, etc…”)

Progress –

Two aspects of life with Ralph-e have been pleasing. Beforehand I’d wondered if the weight would be a concern when folding/handling/etc & I also pondered if converting my Alfine 11-speed Brompton was the thing to do? Sure I’d like less weight but I’m coping & learning more. The knack to folding the front wheel is first to anchor the bike down by putting my toes on the rack/left-side Eazy wheels & then grasp the handlebars by each grip & lift well up until the front wheel naturally pivots around under its own weight (& the same for unfolding, where the increased weight pivots the front wheel very readily). If/when I need to lift the folded bike, my right hand grasps the mainframe just behind where the front tyre is close to the frame & my left hand lightly holds the luggage bag handle for balance. (Leaving the bag on the bike saves the inconvenience of disconnecting the battery in the bag. I’ve seen systems that allow an automatic electrical disconnection through the luggage block; maybe one day but so far so good?)

My logic for converting the Alfine Brompton was somewhat guesswork. A brief test ride of a 6-speed Brompton fitted with a cadence-based pedal assist (not a torque sensing system that I was intending) showed the disadvantage of stopping pedaling to change gear; the power goes away & your next pedal action has to start the motor again. (Brompton hub gears don’t like gear changes with pedal load whereas the Alfine hub can change gears under load, allowing me to keep pedaling & just change up or down through the 11 gears as necessary.)

My medical condition necessitates low gearing on my Bromptons. 6-speed Clarence & Robinson both have 40T chainrings & Ralph-e’s Alfine 11-speed has a 44T chainring. Ralph-e has 2 gears lower than a “reduced” 44T Brompton’s lowest gear (3 lower than a standard 50T unit) & an upper gear equal to a 44T bike. Before the electric conversion, I would start changing down early at hills to minimise fatigue & maintain some momentum. Now I’m having to re-learn many riding strategies when I can ride harder in higher gears & then quickly change down as/when necessary. Ralph-e’s lowest gears are getting a lot less use & I’m constantly changing up & down through the gears. I’m also learning about the e-bike setup with a torque sensing bottom bracket (supplying power to the motor proportional to my pedaling load). For example, on a recent gradual small rise Mrs Aussie had been well ahead but I quickly caught back up when she naturally slowed on the hill. I assume that the increased pedal pressure on the hill had the torque sensor supplying more power & I was accelerating up the hill while just maintaining my cadence? (A bigger hill would have seen me increasing my effort & changing down but this time I had a “magic carpet” sensation?) Every ride is a delight, with the power feeling smooth & natural with just my pedaling – “as it used to feel but now even better?”

Another aspect of the pre-conversion conundrum was Pedelec vs Throttle. I wanted to be able to ride my bike as naturally as possible & preferred to avoid using a throttle (assuming it to lessen the natural riding experience, although the sensation of opening a throttle & enjoying a surge of power is very appealing?). As such, I liked the theory of a torque sensing pedal assist, (as compared to the straight-out cadence measuring system) & thought I could get by without combining it with a throttle. During my first days with Ralph-e & experiencing big hills, I temporarily fitted the throttle supplied with the conversion kit, to see if it was going to help. I found that it didn’t provide any more power from the motor over what pedaling was achieving (& that pedaling was essential, rather than expect to ride on throttle alone!). The throttle is now consigned to the luggage bag, just in case the TDCM bottom bracket should fail far from home?

Interestingly, my brief test rides with various throttle systems has shown quite some differences. I don’t just mean thumb-control vs twist-grip; factors such as smoothness, sensitivity & effort were all on display. Also, the ergonomics come into play when some bike setups require a throttle on the left. One aspect for me about using a throttle, is that I would be using it everywhere; I need the motor on flats as well as hills (unlike some riders who would just use a throttle to help the effort on hills). I’m kind of glad I’m not having to choose or depend on a throttle?

Ralph-e learning

My new ebike world is progressing nicely. So far, rides on Ralph-e (a recent electric conversion of my Alfine 11-speed Brompton) have totaled about 200km along mostly coastal bike paths. Mrs Aussie has laboured somewhat while I basically cruised (the reverse of our previous ride efforts for some years?). I coped with savage headwinds & stiff hills without much concern, although a certain amount of guilt nags away (for a while?).

My technicalities recipe is to take one Brompton, add a 250watt Crystalyte motor to the front wheel & mount a 20amp GrinTech controller above the rear of the front mudguard…
Fit a TDCM torque sensing bottom bracket, with a hole drilled in the bottom of the frame for the cable connection…
Mount a GrinTech Cycle Analyst computer to the handlebars & join everything together with a wiring loom…
…and finally, include a battery (in my case, an eZee Lithium-manganese 36volt 15AmpHour, i.e. 540WattHours) within a Brompton bag at the front…
The whole experience has been an illuminating & exciting learning curve, from the ride characteristics (sounds, power-off lag (especially on slow-speed maneuvers) & smooth power) to the technical data available from the computer system (up to 11 displays for ride, motor power, human power & energy data). Choosing to “go electric” was a concern for an appropriate ride experience (brilliantly answered?), a quality product (very satisfied, even considering the likelihood of an eventual Brompton ebike release?) & a deciphering of all manner of ebike jargon & implications (eg cost, weight, power & range?).

The info & stats from the computer display has provided insights & understanding for my ebike adventure. Rather than the experience of observing a series of lights representing battery level or power levels, while riding I can see the exact consumption from the battery (amphours), my output level (human watts), economy (watthours consumed from the battery per km ridden), the usual bike computer data – & other stuff I’m still getting my head around. However, determining the all-important battery range is still a work-in-progress while my economy level has been improving with re-configuring & fine-tuning for power output. So far, a range exceeding 100kms (depending on the demands of the ride?) is on the cards – although probably not on my agenda?

Brompton weight was something I could estimate pretty accurately (about 4kg?) before the conversion although battery weight was an unknown while I was unsure what battery size to use. The 540Wh unit I decided on is great for range but adds another 4kg in weight. As usual, front luggage weight on a Brompton has virtually no affect on ride handling. I’m becoming quite proficient at folding Ralph-e with the front bag in place & the folded handling has been helped with the inclusion of a rear rack.

The final word on my Brompton ebike experience to date: priceless!

Introducing Ralph-e…


i.e. “Ralph” (my Brompton Alfine 11speed) plus a Grin Technologies Brompton conversion kit equals “Ralph-e”

My previous blog post on “Electric patience” mentioned a coming electric conversion of one of my Bromptons, rather than wait out the eventual (?) release of a factory electric Brompton. What I’ve now got from Glow Worm Bicycles (thanks Ali, Maurice, Tim, Manny, et al) is possibly my ideal setup: a Pedelec Brompton, requiring that I still have to pedal everywhere but providing electric motor assistance for hills, etc.

Ralph-e has a torque sensor bottom bracket (& no throttle control), a comprehensive computer display & a whopper battery. There, that’s my technical info nicely simplified – until a future post? (Oh, & the setup is capable of regenerative braking if I add the e-brake levers but for now I’m unsure if I’ll bother.)

So far my little solo test riding has shown an enhancement to my “Brompton Grin” & I’m quite hopeful of comfortably keeping up with Mrs Aussie? We’ll see.

Electric patience

I’m trying to be patient & any day/week now there should be a call? My patience for the electric Brompton has been frustrating, with so many rumours & release expectations. It’s been a constant for many years, as has my need for low geared bikes to provide assistance for riding with a heart condition. I can choose between six-speed Bromptons with 40T cranksets or an Alfine 11-speed with 44T but under some riding conditions I’m still struggling at walking pace. So the desire for a Pedelec Brompton (one that I still have to pedal to get electric motor assistance, rather than just push/twist a throttle) has been a hope for “normal cycling”. Will the electric Brompton dream eventuate?

Recent news from Brompton on a likely introduction is the latest release info, but wasn’t very encouraging from my point of view. The Brompton announcement (http://www.brompton.com/News/Posts/2016/Electric-bike/) has expressed the release as “selected European cities in Summer 2017” (i.e. maybe July 2017?) but who knows when for the global market?

Armed with some “UK-trip scuttlebut” & fresh research, I decided to check out local offerings for the possibility of a Brompton conversion. My initial findings weren’t very encouraging for obtaining a satisfactory product – but then I visited a shop where their conversions matched my quality & engineering expectations. At present I’m not going to mention the business name owing to various reasons – & Brompton restrictions? – but suffice to say they now have one of my Bromptons for conversion.

Progress has been slower than I’d like due to workloads & component supply but really, everything is bearable in comparison to the alternatives? The conversion components are from Grin Technologies, a Canadian company that offers a Brompton kit (http://www.ebikes.ca/product-info/brompton-kit.html/) with various options; my choices to be revealed once my Brompton is completed. Fingers crossed for that call soon?

2015 Best wishes

Christmas has come & gone & best wishes for the New Year that’s now with us. News from the Aussie household is that Mrs Aussie has been back on a bike since her broken arm in late October. In fact, she’s had a short bike ride each day this year & seems to be coping well, aside from some pain/difficulty from rear wheel braking with her left hand? Any day now we may even be able to get out on our bikes together, as I’ve been rather restricted with my own left elbow ailment; a severe infection. My energy/motivation level has been down a bit, just as our outdoor temperatures have been too warm lately. Sounds like a coastal cruisey-ride is in order & coming soon?

Even though my recent endeavours to make my Brompton C bag fit well onto our flat-bar S type Bromptons have worked out well (see the recent “Bag & frame flexibility” post), I couldn’t resist picking up an S bag at Belrose Bicycles’ Boxing Day sale. The Barcelona model bag will readily avoid any confusion with Mrs Aussie’s standard S bag (& maybe spur her on to produce her own S flap?) Here’s Clarence with the Barcelona bag –
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News from the Brompton world can’t get much better than an OBE in the New Year honors for the Brompton MD, Will Butler-Adams. I’ve had a few meet-ups with Will & an award for “Services to UK manufacturing” is typical of the man; his enthusiasm, passion & leadership goes far further than Brompton & is first class. Here he is inspiring some Sydney-siders during a visit –
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