New Rose bike

jdallan

Esteemed Pedelecer
Jan 18, 2013
306
165
After much deliberation, trials and seeking advice, I finally bought a Rose Black Creek E6 pedelec using the big 70 birthday as an excuse. I thought I would emerge from under my stone to share my experience of the bike to date.

Price apart, buying the bike was made easy as I found Rose really helpful to deal with and any questions I had were answered efficiently, both by 'phone (free phone) and email. Delivery was quicker than expected and the bike arrived well-packaged with little to do other than positioning the handlebars and attaching the pedals. Unfortunately the BionX battery had suffered cosmetic damage in transit however it was promptly replaced when this was brought to their attention (Rose also offered a discount if I wanted to keep the damaged battery, however as I didn't want to spoil, even in a small way, the appearance of a superb bike, I opted for the replacement).

The bike has the matt-black finish and is, in my eyes, quite under-stated but beautiful. Although it weighs about 24 kg it feels light and responsive and is comfortable to ride thanks to Marathon Supreme tyres and suspension forks. The BionX system is silent in use and has 4 levels of assist. I have yet to use level 4. There are some short, steep hills around where I ride and to begin with I found that the motor took me comfortably up most of the way before assist faded when it was most needed. Initially I thought this was a "cadence" problem however I have found with experience, having now done over 350 miles, that selecting the right gear and assist level, in advance of the climb, produces the required assistance to the top.

I suspect the range is about 40 to 45 miles with economical use of assistance, however I have not put this fully to the test as my normal ride is no more than about 20 miles. I did 41 miles over two rides without a charge in between, however I don't think there was much left in the battery at the end. The BionX system has regeneration modes which I use when possible however I think this is more of a gimmick than a benefit - although to be fair on one occasion while using it I noticed the battery symbol go up a bar, showing that some charge had been restored.

Overall I'm delighted with the bike, however there is one fly in the ointment (isn't there always!). The bike produces a "ringing" noise from the rear when the pedals are under load. The noise was present from the first ride and initially I thought it was coming from the rear brake and would disappear with time - unfortunately it didn't. I then realised that when I stopped pedalling the noise stopped. I eventually contacted Rose about the noise and they immediately arranged for the bike to be returned to them to be checked out. I was a bit apprehensive about this however it went like clockwork and the bike was returned in just over a week. I was advised that the source of the noise was the chain guard which had been replaced. The bike had also been given an inspection service (gear adjustment, etc) at my request, the BionX system upgraded and a repair made to reconnect the wiring to the console mount which I had dislodged when trying to get the bike into the box for transit. Unfortunately, 7 miles into my next ride the noise returned, less than before but still there and that's how it remains. It's no big deal and I can put up with it but I'd obviously prefer to have it stopped; so if any one has any ideas or suggestions I'd appreciate them. I've described the noise as "ringing" for want of a better term but "harmonic" might be more appropriate as it's a steady note, similar to running a finger round the rim of a glass. As I've said the noise stops when pedalling stops and it also seems to be reduced and nearly stopped by changing down a gear or two.

Apologies for the length of this post.

Jim
 

Zebb

Esteemed Pedelecer
Jun 13, 2012
371
12
Good luck with your new bike. If you cant work out why the bike is making a noise, which sounds like its
the angle of the chain across from rear to chain ring in certain gear, I would take it to local bike shop, I am sure for a few quid they would sort it for you, much better than sending it back. Or someone local with bike stand would soon find the fault. Again good luck with it.
 

flecc

Member
Oct 25, 2006
53,271
30,654
Just looked at the the bike on their website and I'm sure it will just be the chainguard again. Having a close fitting chainguard like that with a derailleur is always prone to suffering some contact between chain and guard.

Try checking for possible contact points and adjusting it yourself where necessary. A few tweaks with riding checks following and you may soon find the suspect points for the future.
 

jackhandy

Esteemed Pedelecer
May 20, 2012
1,820
323
the Cornish Alps
Just a thought, Jim:

I recently lined-out my van to make a day-van & bike transporter & used Flashband to deaden the roof & side panels: Before I did this the roof resonated with a low frequency rumble - now it's just about silent.

What I'm getting to, eventually, is that it could be worthwhile trying a gobbet of Bluetack or similar, to see if the chainguard is resonating. If it is, maybe you could use epoxy adhesive or w h y to fix a bit of mass to the inside of the chainguard, if there's space.

The only thing more agravating than a constant unidentifiable noise, is an intermittant one. Mine was caused by miniscule clearance between front brake caliper & spokes: Sometimes they'd sing as they brushed past.
 

Croxden

Esteemed Pedelecer
Jan 26, 2013
2,134
1,384
North Staffs

jdallan

Esteemed Pedelecer
Jan 18, 2013
306
165
Thanks for the replies and advice. I'm relieved that the chainguard is still the main suspect. I have to admit that I was a bit dubious when Rose advised that it was the cause.

flecc - I'll do as you suggest and, I hope, identify and cure the cause of the noise.

jackhandy - I like your suggestion re resonance - this had occurred to me and it's just that kind of noise. I'll do what I can to deaden it. If I succeed it'll lift my satisfaction with the bike from 95% to 100% :)

Thanks again.

Jim
 

D C

Esteemed Pedelecer
Apr 25, 2013
1,142
577
I get a very slight resonance on some road surfaces from the disc brake rotors, I can sort of reproduce the "tone" by lightly plucking the edge of the disc with my fingernail, a little like plucking a guitar string (whilst stationery of course:)).
It's not there all the time and doesn't worry me now I know what it is.
 
D

Deleted member 4366

Guest
I've heard that some sine-wave controllers can make the motor sing at certain speeds.
 

jdallan

Esteemed Pedelecer
Jan 18, 2013
306
165
On a short ride (12.5 miles) yesterday, I found that the noise was present when using the middle range of gears. When I used the high gear range for most of the ride the noise disappeared completely. It's obviously related to the position of the chain from front to rear and in relation to the chainguard.

Jim