Bottom Bracket Gears?

General cycling advice ( NOT technical ! )
Mike_Ayling
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Joined: 25 Sep 2017, 3:02am
Location: Melbourne Australia

Re: Bottom Bracket Gears?

Postby Mike_Ayling » 29 May 2018, 12:41am

The Pinion has two further advantages over the Rohloff and indeed all other IGHs: first, its central position means better weight distribution than the "rear-heavy" IGH; and second, rear wheel removal is easier without having to disturb the shift cable(s).


If you have the Rohloff EX box you simply unscrew a thumb screw and remove the EX box from the hub. Takes no time at all.

Mike

Manc33
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Joined: 25 Apr 2015, 9:37pm

Re: Bottom Bracket Gears?

Postby Manc33 » 30 May 2018, 10:52pm

Sounds like you are either going to either have a big fat bottom bracket, or not many gears, if you had both then magic is occurring somewhere (or an internal geared BB that's going to wear out fast). If I was going this route I'd get a Rohloff Speedhub. We can dream. :)
When two cyclists get married, they should throw anodized cable crimps instead of confetti.

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Cunobelin
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Joined: 6 Feb 2007, 7:22pm

Re: Bottom Bracket Gears?

Postby Cunobelin » 31 May 2018, 9:09am

MY Gekko has a 20" rear wheel with Rohloff and spinning out was an issue

A Sclumpf HSD combined with the Rohloff gives a massive gear range that allows for speeding along the flats, and climbing steep hills

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[XAP]Bob
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Joined: 26 Sep 2008, 4:12pm

Re: Bottom Bracket Gears?

Postby [XAP]Bob » 31 May 2018, 9:28am

Manc33 wrote:Sounds like you are either going to either have a big fat bottom bracket, or not many gears, if you had both then magic is occurring somewhere (or an internal geared BB that's going to wear out fast). If I was going this route I'd get a Rohloff Speedhub. We can dream. :)


The pinion is a specialist 'big fat' bottom bracket.
The schlumpf isn't, but only has two gears (albeit very widely spaced in the HSD)
A shortcut has to be a challenge, otherwise it would just be the way. No situation is so dire that panic cannot make it worse.
There are two kinds of people in this world: those can extrapolate from incomplete data.

Inigo
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Joined: 27 Aug 2019, 1:08pm

Re: Bottom Bracket Gears?

Postby Inigo » 27 Aug 2019, 1:15pm

elduderino wrote:I purchased a Kalkhoff P18 through 50cycles in Loughborough.
I replaced the handlebars & headstem ( I prefer sitting upright on a bike). Replaced the seat post with a suntour cam action seatpost, & my most comfortable Brooks B67 saddle .
Replaced the tyres with my schwalbe Marathon plus tour’s
My average speed is 11mph , & it’s the most enjoyable cycle riding I have ever had, & can’t wait to jump on the thing.


Hey there. Just stumbled across this post. I am looking at buying a Kalkhoff P18 at the moment, but I'm struggling to find accurate specs. In particular, I would like to know what the total weight of the bike is! I have seen quite varying numbers. For example, in the specs of this Youtube video it is given as 16.35kg which seems ridiculously heavy for a non-ebike and puts me off. Conversely, the archived page from the Kalkhoff site gives it as "130kg" (I assume they mean 13.0kg!) which seems much more reasonable.

Can you comment on which is closer to the truth? How do you find the weight of the bike?

I hope you see this, I would hugely appreciate your reply if you do. Many thanks.

elduderino
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Joined: 2 Jun 2016, 6:25pm

Re: Bottom Bracket Gears?

Postby elduderino » 7 Feb 2020, 7:30am

Hi
Sorry, just saw your post.
I don’t know the weight of the bike. I have no way of weighing it.
Whatever it was, I can tell you it’s a lot heavier now, since The first things I replaced were the seatpost with a Sutour CNX cam action post, the saddle with my eight yr old Brooks B67 , the pedals with a pair of pedaling innovations catalyst pedals , & an angle adjustable handle bar stem.
As you can see I am in to comfort, not speed( at 69, I am in no hurry to get anywhere . ). I just plod on at an average speed of 10mph, bolt upright, wishing I was in Amsterdam .
All I can tell you is the bike, with its Pinion gearbox, & gates carbon drive, performs brilliantly, I use the bike everyday for journeys that don’t require a car. plus an early (5am) Sunday morning 30 mile rides, to avoid cars.

Manc33
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Re: Bottom Bracket Gears?

Postby Manc33 » 5 May 2020, 10:07am

Mick F wrote:600% eh?
Is that all?

Try my Moulton TSR90 with 740%.
16" to 134"


You're beating mine (14" to 111.5")

I always see your posts with this and wonder how to get more top end.

I just don't know how, since I am on a 22 granny with 40t rear / 48t outer with 11t rear.

My rear mech already can't handle the capacity on a MTB (it can on a road bike due to a shorter chainstay length, but is at the limit). I don't need the 134" you've got, but 111" doesn't cut it for me, it needs 1 more higher gear. Going to a 53t outer would make the already stretched capacity even worse, although I think my FD would possibly cope with it as long as I also added 5 teeth to the middle chainring, which I'd also prefer to be bigger anyway (from the current 36t).

Even with a 53t outer that would still put me at 123" so I don't know how you're doing it Mick F but I am sure you've said in the past. :mrgreen: It was so long back I can't remember.

My lowest gear being 14" is ludicrous, you need to be cunning to balance, or pedal faster. :) I can just about manage it and if I change anything to affect the balance like put a stem on 2cm shorter, it becomes pretty much impossible to use that lowest gear and I have to use the next sprocket down, however the low sprocket comes in handy on the middle chainring and avoids using the granny in a lot of circumstances where I might otherwise be dropping to it.
When two cyclists get married, they should throw anodized cable crimps instead of confetti.

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simonineaston
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Joined: 9 May 2007, 1:06pm
Location: Live & work in Briz'l

Re: Bottom Bracket Gears?

Postby simonineaston » 5 May 2020, 10:19am

Pinion / Gates combo sits patiently in my fantasy To Do list, waiting for the day when I win the pools...
ttfn, Simon in Easton
(currently enjoying a Moulton TSR & a nano Brompton...)